In all 3 cases, someone forgot to pull it out.
You will get burned, you idiot.
Because it was pi-rated.
If you pull the plug, the vegetables start to decompose.
Both of them are hard to pull out of.
3, and the rest are true stories.
The finish line at the Boston Marathon.
It's dangerous to hit a lightbulb with a bat.
She delivers.
Forget it once.
Because they make up an awful lot of stuff. EDIT: Because I forgot about neutrinos.
Some douchebag forgot to pull it out in time.
Failure to pull out in time
In each scenario, there's a dumb guy who didn't take it out in time.