New Teacher: I was an orphan as a kid.
Students: Damn.
Teacher: Is anyone missing?
Students: Your parents!
Listen up, buttercup. You obviously ain't got the brainpower to see this one. So, the teacher says they were an orphan, right? Then the students hit 'em with the ultimate zinger, implying that their parents are still "missing," as in, dead. Get it now, genius?