Someone mistakenly leaves the cages open in the reptile house at the Zoo and there are snakes slithering all over the place.
Frantically, the keeper tries everything, but he can’t get them back in their cages.
Finally he says, “Quick, call my mother in law!”
“Your mother in law? Why??”
“We need someone who speaks their language!”
This joke is included in the Black Book of Jokes. You can order it from here.