One day in school, you saw a short girl wearing a witch's hat practicing magic tricks. Just for fun, you decided to tease her a bit by commenting on her size. She became very defensive and upset about it, but ignoring that, you carried on, until she stamped her foot and shouted:

'I'll show you who's the baby here!'

She walked away then. You thought nothing of it...until you woke up tomorrow...somehow diapered.