A dog has a better understanding of no.
A: One's a phony buck.
The 2nd floor: (SPLAT) AAAAAaaaaaaaagggghhhhhhhhhhh...... The 20th floor: AAAAAAAAAAAAAAAAAAAAaaaaaaahhhhhhhh!!! (SPLAT)
He stayed up all night wondering if there was a dog.
A police dog in disguise.
Four. One to change the bulb and three to make a t-shirt about it.