I remember that one of my high school teachers, back when HE was in high school, was apparently going to pick up his girlfriend for something. On the way, he ran over a cat, and noticed the tag said "Fluffy". Anyway, he continued to his girlfriend's house, and was invited to stay for dinner, so to make small talk he explained why he was late (running over this random cat). He'd just finished relating how he'd remarked, upon reading the cat's name tag, "Well you aren't so Fluffy now!" before noticing that the family was between horrified and crying. At which point he realized it was their cat.