Because they pull out at the last second.
My dentist just pulled one of my teeth out. I don't see much to laugh about in that. But it was the wrong one!
Failure to pull out in time
Edit: nevermind...
You have only one second to guess the answer. No pressure.
Because when they immigrated from Italy, customs stuck a label on their lapel reading ToN.Y.
The "spaghetto"