Slightly off topic, but this thread reminded me of when I first watch the Magical Mystery Tour. From memory, in one of the scenes with the magicians, Paul keeps asking what time the bus leaves (or arrives?). And I think at some point someone gives him the time. Being a Beatles fan, I took that time (when the bus was leaving) and made it into the PIN of my credit card (thinking I will never forget it). Naturally, I forgot it the next day. So I sent a message to my sister "What time did Paul say the bus was leaving?" As it was out of context, she first had to ascertain who is Paul and then try to remind herself of that particular scene. As a result she couldn't remember and I got locked out of my credit card!
Still makes me laugh after all these years. But I have learnt my lesson, always create meaningful and easy to remember PINs!