A game about:

• Waiting in line at the dmv
• Studying for a final exam
• Folding a fitted sheet
• Pokemon but you can't catch or train pokemon
• Browsing Reddit
• Watching grass grow
• Watering a fake potted plant

The worst game idea I can think of?

The Wacky Adventures of Arsonist Peepee in: “Running from the German Skunk Fursuit Police while Denying the Holocaust”

Edit: Though to give a more serious answer, there is one that I had. A while back there was somebody on here who kept posting threads about hating Visual Novels, stuff like “what would you do if you found your kids playing them” and the like. So as a joke I started making something called “My Son Will NOT Play Virtual Novels”

The entire thing was going to be an anti-VN where you assumed the role of a father (as opposed to most VNs customizing your persona) dead-set on having his rebellious teenage son be shielded from VNs after they killed the rest of their family. You would have had no outward customization of the characters, but instead your son would react to how you behaved, and that would have lead to different scenarios (i.e. giving your kid a laptop but being strict would turn him emo, and thus he gets into online roleplay and from there writes a VN, leading to a lose-state). And at the end of most of the scenarios where he inevitably picks up a VN, the player/father would enter a minigame where they brutally kill the son in some cartoonishly over-the-top way (i.e. chasing his bike down from the family car lined with nitro, smashing all of his bones in a sumo ring after catching him with an 18+ VN, smiting him with lightning after the VNs turned him gay, etc etc) all while the BG music changes to some crappy screamo of me shouting “I HATE VIRTUAL NOVELS” over and over again. And then for most of the endings would have just been you getting put on death row.

Dropped it after a bit since I’m having a lengthy time making a simpler game than that, so I won’t be upset if someone lifts that idea.

This is a great idea for a game jam! And it can be a bad idea in terms of theme or mechanics:

1) 50 Shades of Grey- nothing sexual, that's just the palette you have to use.

2) Rebellious Hero- your character constantly ignores your input, or delays their actions, or does something else altogether.

3) Lost in Translation- a text-based game (VN, choose your own adventure, point n click etc.) where the text is fed into different languages in Google Translate repeatedly until it barely makes sense when it returns to English.

4) Jack of all Trades Jam- all the art and graphics have to be hand drawn by the coder and scanned in, and all the audio recorded from their own voice. Ideally this should be a solodev jam, but small teams are ok so long as nobody with any drawing, voice acting or singing talent joins the team. Any dialogue must also be written by someone who hasn't even attempted to write a story, poem or article since they were forced to in school.

5) Diplomatic Solution Jam- Sure, Mario may be fun, but wouldn't it be better if the representatives of Bowser and the princess got around a table and discussed a future for the Mushroom Kingdom that was acceptable to all parties? Similarly, instead of all the mindless violence in Doom, maybe their differences should be settled peacefully by the UN? Unleash your inner bureaucrat with Diplomatic Solution Jam...

Another crappy idea: you know how crappy mobile games try to make money through in-game purchases, gachas, and ads?  Make that the entire game.  Gachas that contain ads that unlock in-game purchases for more gachas, with no actual game behind any of it.

Walking simulator where you have to walk 100 miles and you walk at 1 mile per hour and if you stop at any point  before the end you go back to the beginning.

based off of a real dream I had: walking around in a PS1 graphic style store and paper cut outs of people jump out from the walls to ask you to bring them stuff, a good example is when  Freddy Fazbear appeared next to a refrigerator and asked me to bring him a quesadilla in a deep demonic voice.

I guess this won't sound like a bad idea at first:
Lemmings with portals (or teleporters)
so you try to save a bunch of little dudes by getting them to the exit
and you can place a portal entrance and destination with the mouse

pay 2 save 

You know the saying a watched pot never boils? Yeah that

I am not sure if I understand the term "game concept" correctly in context of a premise.

A premise would be more of a story thing. Like the classic boy meets girl.    And most of the concepts I read  are rather mechanics. And ways to frustrate the player. But   player frustration is a rather   well working concept ( I am looking at you, Dark Souls).    And even the silliest concepts like idle games do exist. Cookie Clicker was specifically designed to be a non-game.   So I am not sure, if there even is such a thing, as a  bad game concept.  Because, well, everything that is new is exciting, therefore, if you manage to come up with a bad concept it would be new and exciting and it were a good concept for the novelty alone.

(Oh, and watching paint dry?  Seriously?  People will use it as an awesome screensaver. Also, would not be a game, but a movie. You woud have to add blow dryers,   open windows,   use a fan, etc, (but that would be the awesome execution probably))

That being said:

A typing learning    game, but the words are spelled wrong. 

A game about being invisible in an unlit room.

 A match-1  game.

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Examples for previously thought of "bad concepts", to illustrate my point   ...

A game where you have to control passports.

A game where your character can die permanently.

A game where you try to score with the ladies. But fail.

A game where you have to read. Lots and lots.

A batman game where all you do is invest as bruce wayne