Because a vasectomy would heal in seconds and he doesn't look like he'd wear a rubber or pull out.
I think it's because usually the punchline is too long
Rrrrrrrr? You think it be R but it be sea
Because 30 is too many!
By putting flowers on the grave.
When talking to you, the extrovert mathematician looks at *your* shoes.
They don't like to look down on the unemployed
The leash goes slack
A piebald horse pulling a cart!
It doesn't make sense, he and all his friends are always stuck in second gear
Don't look I'm changing
It didn't Fett.
An investigator. Ba dum tss.
Made you look!
Sir" from a distance.
They are both X-Men
A Fixie.
There's a vas deferens.
I can't, I'm not a conductor.".
It was a Good Year...