When I was little I used to think that the sign outside taverns advertising Free Pool meant that anyone could go in and go swimming.
A childhood belief about excursions

others believed things like this
- I used to think that a "pool shark" was an actual shark that lived in a swimming poolAnon
- I believed that the ladder on the back of a trailer/rv led up to a swimming pool.— marilese
- I used to believe that if you farted while swimming in the pool, it could propel you foward really fast.— Rick
- Up until I was in 3rd grade I believed my bathing cap is what kept me afloat in the swimming pool! Anon
- When I was a kid I used to think the "carpool lane" was an actual pool cars went swimming in— skeez
- I thought for the longest time that a No Standing traffic sign meant no person should stand near that sign.— Shannon