Use "foul up" in a sentence

1. trusted not to foul up, not to mount the pavement, all those pedestrians the drivers trusted not to walk out in front of them, to remember their

2. But he couldn’t let the desire for revenge foul up the master plan

3. It’s okay for the parents to foul up the kids, try to teach them anything useful, or accurate; or arcane notions, like evolution, or freedom of inquiry, and they get uptight

4. I partly blame all those dopes that clap their heads off--they'd foul up anybody, if you gave them a chance