Cliff
Throw a penny off. How do you get the other half to jump too? ... Tell them no one found it yet.
Watching your mother-in-law backing up towards the edge of a cliff in your new BMW.
Son: Dad, is God man or a woman? Dad: His both, son. Son: Dad, is God black or white? Dad: His both, son. Son: Dad, is God good or bad? Dad: His both, son. Son: Dad, is God - Michael Jackson?
THESE are the brakes!
You can't cross a scalar and a vector.
Nothing, you can't cross a vector by a scalar. EDIT: changed multiply to cross.