This occours when you are wearing a Snuggie and you pass gas. The snuggie material traps the gas ,sometimes for hours, until you get up and are surprised by the smell emitted.

when you've done something so cringe you can't stop replaying it in your head and it stops you from getting on with your every day life

While doing it snuggie style, the receiving end accidentally drops a "surprise", causing the upper half to scream and cry about shit leaking everywhere. Although the snuggie is warm, the warmth of feces is never warranted; therefore, it is always a "surprise".