Whats the dumbest, stupidest question anyone has ever asked you?

[LISMDK]

Back in 11th grade biology a girl in my class asked the teacher "Is it true that all babies are born female and then some of them grow penises and change into boys?" I was in disbelief and the entire class stared at her. The teacher looked dumbfounded. That same girl has said some other really stupid stuff but thats easily the worst.