hot brass dance 

The involuntary and hilariously frantic motions of a person at the shooting range who has just had a scorching hot cartridge case fall down inside their clothing. Double hilarity points if it's a lady with a hot case trapped in between her large exposed knockers. Triple points if somebody ends up instinctively "going in" to help her out.

Can be generally avoided by not tucking your shirt in if you're shooting an autoloader, and not permitting women with low-cut tops at the range.

A: "Did you see Jim at the range the other day? A case ended up inside his shirt and he had to do the hot brass dance while everybody laughed at him."
B: "Hahahah! How's he doing?"
A: "Burn on his beer belly, but otherwise fine."

hot brass dance by Baroque T. Frankenheimer February 2, 2014