Magic Mirror

A young woman buys a mirror at an antique shop and hangs it on her bathroom door.

One evening, while getting undressed, she playfully says "Mirror, mirror on my door, make my bust-line forty four".

Instantly, there is a brilliant flash of light and her breasts grow to enormous proportions. 

Excitedly, she runs to tell her husband what happened and in minutes they both returned.

This time the husband crosses his fingers and says "Mirror, mirror on the door, make my penis touch the floor!".

Again, there's a bright flash... and both his legs fall off.