Was it my knees Do I have terrorist's knees Oh, the bomb. Not the knees then That's good.
A certain number! One to actually perform the task, and the rest to act in a manner stereotypical of the group.
A: Enough to reinforce my negative stereotype about them.
Because she ate all the cookies and didn't know how to make a sandwich.
A: The knocking always speeds up.
One because his knee grows.
Because their knee grows.