Good Question

Why do doctors send you behind a curtain to undress when they're going to see you naked anyway?
 

Smart Alec

A stoner stumbles out of a party, and starts to walk home.
One the way he bumps into a guy who is all bloody and mangled. The guy limps up to the stoner and says "Call me an ambulance!" The stoner looks at him for a second, smiles and says, "You're an ambulance!"

Wise Lady

My grandma always told me "Never share needles"
She was very possessive when it came to knitting