What do you call a cow with three legs?
My ex.
What do you call a cow with three legs?
My ex.
Alright listen up, buttercup. This joke is funny because it compares an ex to a cow with three legs. The punchline "My ex" implies the ex is seen as deficient or incomplete, just like a three-legged cow, which is also a kinda insulting, and this bear loves insulting.