People see this Rolex and they kill themselves.
Motherfucker, that's a suicide watch!
Killer Rolex
Explanation
Explain Bear
Listen up, buttercup. The joke is about a fancy watch, a Rolex. People are so jealous of it that they off themselves. But wait for it... the watch is a "suicide watch," which is actually a type of watch for folks who might harm themselves. See, it's funny because it's not!