Remove the vowels in his rack.
Neither of them can finish a play
Because they don't exist
Remove an electron.
Soy milk. -Hola milk, soy tu padre. Edit: Removed the "es" that was bothering everyone
Four. O, double-u and e.
Because everytime he tried, he kept owing his son money!
It had run out of lettuce
I'll re-rack.
Well you'd be green too if someone racked your balls.