This happened when I was five:

So they have this thing called the Lazy River in the water park back at home. You just lie back on an innertube and follow the current. There's a few hazards along the way like a waterfall and fiberglass frog that spews water. Anyway, there's a sign that says "ENTERING SHARK INFESTED WATERS" with a super-scary painting of a shark eating children. I smurfing wig out and start trying to paddle upstream to save myself. My aunt senses my fear and floats over, looks me dead in the eye and says:

"You had an older brother who got eaten by a shark on this ride. Your mom never told you because she was really sad about it."

Freak out, cry more, sit in the kiddy pool the rest of the day. I learned that sharks can't live in chlorinated water shortly after that though!