Cannibal's Expectant Surprise

What does a cannibal call a pregnant person?

A Kinder Surprise.

Explanation

This is a pun. It plays on the fact that a "Kinder Surprise" is a chocolate egg with a toy inside. The humor comes from the cannibal's dark twist on this by viewing the pregnant person as a sort of "surprise" with a baby inside, like a Kinder Surprise egg. So it's funny because of the dark, unexpected comparison to a chocolate.