Kaboomerang
A kaboomerang is like a punch in the gut that you asked for and then got for free.
He promised to clean his room. Now it’s a war zone and he’s hiding under the bed.
She bet $20 she could eat 10 hot dogs in 5 minutes. Now she’s crying and the hot dogs are laughing at her.
He lied about being rich. Now he's living in a tent and eating expired pizza.