Give a man fire, and he'll be warm for a day.
Set a man on fire, and he'll be warm for the rest of his life.
A man on fire
Explanation
Explain Bear
Alright, listen up, nimrod. So, like, if you give a dude fire, he's warm for a hot minute. But if you torch his ass, he's warm forever, cause he's dead. You see, you are laughing about the irony of being set on fire.