This is something I’ve been playing for a couple of weeks now and it takes shape from a forum which the game was you get to choose your superpower, and the next person to post gets to choose your weakness. I modified it slightly for car and kid use.
For our car game the goal is pick a power, and pick something that makes that power as useless as possible. We had four players, player 1 announces the power, 2-4 announce the weakness, player 1 votes for who had the funniest nullification.
The power to fly / but only to Walmart / but only an inch off the ground / only naked
Invisibility / but only when people aren’t looking
Power to change size / everything in the entire universe also changes sizes accordingly
Can control minds / but only of people who agree with you
Can get insanely strong / becomes intangible / the world’s strongest ghost
Can set things on fire with your mind / only things that are already on fire though
Really fun car game that the kids have requested to play again and again. Only advice on this is make sure they understand that it needs to be a simple power, it can be repeated, and the answers are what’s supposed to be amusing and not the power.