Overheard: Diapers

F (almost 3) was sitting on my lap, and we were playing things like "This is the Way the Ladies Ride" and other songs. Here's a funny conversation that followed.

Me: I know, let's do "The Wheels on the Bus".
F: Mommy, do the "diapers" one!
Me: I don't think I know the "diapers" song.
F: Yes you do! The "diapers" on the bus go swish, swish, swish!
Me: (laughing) It's not "diapers", it's WIPERS! Like for the rain!
F: Oh!
Me: I don't think we would want diapers swishing on a bus, do you?
F: No, that would be really stinky!