They know their limits.
Hell-if-i-know (my grandma's favorite joke)
It was a no buena My girlfriend is Mexican so I love Mexican jokes. Let me know if you have one!
He works it out with a pencil.
They told him he was good at deriving
A shootout.
2: 'Well, I think I can really push my limits' 1: 'Oh right, are you sure ' 2: 'I'm definite'.
There's a limit to how many characters you are allowed to waste.