Cajun Surprise
It's when you eat spicy crawfish and then fingerbang a girl. At first she's all down with the fingerbanging and moaning and shit. Then, out of nowhere, the spices on your hand from eating the crawfish start burning her bone-collector. It usually doesn't burn in a positive way.
Dude, I made this bitch cry last night from a Cajun Surprise, that batch of crawfish must have had extra crab boil.