Birds Love Dirt is a short, glorious trpg about being a bird that loves dirt.
It's 2 pages with a solid, easy to read layout.
To play, you decide what kind of bird you are, find some dirt, and PLAY IN THAT DIRT!
There's variant rules, in which you might play indoors with a mountain of blankets instead, but regardless of your setting it's hard not to like the dada-istic concept or the game's contagious enthusiasm.
Overall, if you're looking for an excuse to be a bird and/or play in dirt, this is a good game for that. But it's probably even better reading for game designers, as it does a really wonderful job forgetting all other concerns and focusing on the joy of playing.