Person 1 is asking Person 2 about an impending tonsil surgery.
Person 1: Well, just don't end up like my dad. When he was about 12, he went in to the hospital expecting to get a tonsillectomy, but when he woke up, his wee-wee hurt instead! They'd given him a vasectomy too!
Person 2: (confused silence)
Person 1: His mom and dad told the doctors, "While he's out, do the vasectomy too!" He was 12!
Person 2: (more confused silence)
Person 1: Oh, no! Not a vasectomy! A Caesarean! No! I mean, a circumcision.
Everyone in earshot: OHHHHHH.