Ideas I have had:
1. Build Lego, duplo, coins, dice, pebbles, sweets etc. tower somewhere that's in the way of your everyday life. Or somewhere the kids walk past everyday. It's bound to get knocked over but when?
2. I considered this one for 'Adrift'. In Adrift you are thirsty and dehydrated. Start the game with a glass of water. Take a single small sip. Everytime you are asked to take from the tower put a coin in the glass. When it overflows your raft has sunk.
3. Bake 20 cookies/cupcakes or whatever but one of them has chilli in it. When you eat the chilli cupcake it's game over.
4. Bake a cake and put it in the oven. Stop playing when your nerve breaks and you go check it.
5. Complete your daily log while balancing a book on your head. Each time you add a block add a book to your head instead.
6. Put a coin on your elbow then catch it in the same hand. When told to add a block add a coin. Drop the coins the game is over.
7. If you are in the pub (after lockdown) flip beer mats. Add a beer mat when told to add a block.
8. Do your daily log next to something sleeping. If they wake up it's game over.
9. Do your daily log next a randomly set timer/alarm. If it goes off during your daily log the game is over.
10. Replace the tower with buckeroo.
11. Replace the tower with kaplunk.
12. Each time you are asked to pull from the tower place a Domino standing up. Build an elaborate trail around the house. When it gets knocked over (and it will!) The game is over.
13. Plant a seed. Each daily log you water the plant. When you first see it's shoot emerge it is game over. Good for a Martian/terraforming game.