The Missus And The Ex

A man is at a party, chatting to John. Suddenly, his eyes widen and he quickly ducks under the buffet table. Curious, John asks him why he's hiding.

"Behind you... My wife's just found my ex."

John turns around to see the two women shrieking at each other, and promptly ducks under the table too.

"What the hell are you hiding for?"

"It's a small world."