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A fake promise people use when they're about to spill some juicy secrets, usually about the government or one of its stinky departments.
I am not suicidal, but I might be if you don't shut up about that classified file.
I am not suicidal, but I'm getting real close to telling everyone about that secret prison under the White House.
I am not suicidal, but I will be if you don’t stop talking about the alien conspiracy.