It's from the movie "WarGames". The most common password's "123456", btw. That's amazing. I've got the same combination on my luggage.
Every now and again I throw one out that in now way references blow jobs or anal sex. Another classic.
Perhaps, I have just seen too many films over the years. But I got the reference to Wargames, when GP mentioned the name Joshua. Damn, I some times miss the eighties.