Stallone's Law

Pronunciation: \ˈstä-lōnes\ \'lo\
Function: noun

A law of physics, (not unlike Murphy's Law), stating that in the event a main character is being shot at by any amount of bad guys, the main character has a better chance of killing all the bad guys than the bad guys have of killing him.

Friend: "That guy just killed like 50 people! How did he do that?"

You: "Stallone's Law."