I used to think that a carpool was an el camino with water in the back that you could sit in and relax while you were driven around.
A childhood belief about cars

others believed things like this
- I used to think that a carpool was one of those bug, long limosine's with a pool all the way in the back.— Annie
- When I was a kid I used to think the "carpool lane" was an actual pool cars went swimming in— skeez
- i used to believe that the water in the ocean went away a night......then came back in the morning.— Beverly
- I used to think when I peed in the shower as a kid, the water coming back through the showerhead was my pee.— gregg
- I used to believe that if you soaked a raisin (or prune) in water, it would turn back into a grape (or plum).— C.C.
- I thought that hydrogen was pure water (since I knew hydro- meant water) and H2O was impure some how— Hexetic