Ciao is not pronounced see-ah-oh.
The handrails on the escalators move slightly faster than the stairs, stretching you out like a life-size Stretch Armstrong doll.
An Italian optometrist cannot fix your camera, but he will lend you his tiny screwdriver (cacciavite) so that you can try to do it yourself.
If you take too long in the bathroom at the Vatican Museum near closing time, you may find yourself escorted out by security guards.
The Circus Maximus does not have clowns or elephants, just Italians. Still fun to watch though.