A bag of Miky Ways is an extremely happy occasion once it happens to you, but for anyone within earshot it is one of the scariest occurences, if not the scariest in their entire lives.
It mostly includes monsters and bloodcurdling screams of friends.
A: "Oh, shit! I have a bag of Milky Ways!" (Happy/Surprised.)
B: "Waaaahhh!!!! Aaaasadkjhkjhhh!! Aaaahhhhhh!!! (Mortified)
Any performance, decision or act that fails so horribly that the performer humiliates themself to the point of looking like a clown and can no longer be taken seriously by society.