Room Temperature Challenge
When a person is killed its body temperature lowers to that of the room it's in. Clearly you never want to win the room temperature challenge.
The robber thought he could get away with the money but ended up taking the room temperature challenge.
Room temperature challenge
Getting killed.
"Hey, what did you ever do to that guy you were talking about?"
- "I killed him in public, he took the room temperature challenge."
- "I killed him in public, he took the room temperature challenge."