N! One to change the light bulb, and n-1 to display stereotypical behavioral traits of X!
Because Y so serious
Just one if it's Professor X.
There's change in a lightbulb
Whats the point 3rd wave feminists can't take a joke anyway.
It only takes two mice to screw in a light bulb. The hard part is getting them in there.
Just one, but they get extra credits for it
A coconut!
A buck 'n ear
Because they want to prevent plaque build-up.
Stockholm Syndrome.
If I've told you n times, I've told you n+1 times ..."