How many times do you knock on a door in one 'set' of knocks?

Originally Posted by nuttyturnip

I think we've found a new event for next year's X Games: Extreme Door-Knocking. Send the players into a blighted urban area and see how many doors they can knock on before they get beaten/shot.

For the record, I knock 3 times on doors, and think knocking on wood is superstitious nonsense.

I wanna play! :P

I knock 3 times on doors. Normally I don't like doorbells because it's annoying when people ring mine (I don't say anything though). I only ring the door bell at my gf's house (It's a huge house and no one would hear me knocking).

Jam it back in, in the dark.