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My Brother-in-law worked for the L.C.C. and when they first introduced networked computers he proudly told me that his password was easy to remember and even easier to type, I said do you mean 'fred'?
Gosh he said how did you know? I told him that at the time people new to computers always looked for something simple and the most popular was 'fred'! (All the keys are next to each other).

Gosh he said I thought I was being clever.

A few weeks later he said, I've been in touch and got my password changed.

I said, is it 'derf' by any chance? He looked astonished and asked how do you know? I replied that the most popular password for people that are new to computers when they discover that 'fred' is so popular always reverse it and change their password to 'derf'!

Another popular password used to be 'Master' because that was the password used by the evil one in the Disney film 'Tron'.