when prefacing a blatantly obvious statement, observation, or suggestion the use of "might" sarcastically implies the subject is a moron
You might make sure you know her name sometime before jumping into bed.
Too bad your car died! Next time a check engine light comes on you might want to have someone check the engine, huh?
Boy: You "Might" Not.
Girl: I "Might"
Boy: But ya Might not...