We're driving to the Yorkshire coast and will shortly pass through th village of Wetwang. Since the children were tiny we all yell Wetwang!!! in the car as we spot the sign. They are adults now but I still do it even on my own.
Penistone was declared imaginary by a visiting American friend, so if we pass that way we always say "You cannot be serious" just the way she did.
Anyone else have daft family ritual/habits on a road trip?