Lost in music
Car dancing has already been mentioned by one B3tan - but I think I take it to extremes.

I dance in my car - it's a purple MINI convertible.
I dance to handbag house music. Complete with arm movements.
The combination of the music, the roof off the car, the arm movements, and the car itself make me look camper than a row of tents. As well as frequent comments, smiles (more pitying than welcoming) from other drivers, but thankfully no accidents. I daren't listen to Led Zeppelin in the car any more, as the temptation to sing, drum and drive like a loon is just far too dangerous.

If I'm out of the car, I have bluetooth wireless headphones. The flashing blue light on them is bad enough for getting people's attention, but I tend to "frug" (i.e. not dance, but move rhymically) when wearing them. When on the train, this means I'll be typing furiously on the keyboard, then taking my hands off the keys to emphasise a piece of music I'm listening to, often with a grin on my face that's close to a fully E'd up gurn.

All in all though, these aren't guilty pleasures - as I feel no shame about my activities. At least music makes me happy - unlike 95% of the souls you see on the street who look like they want to kill themselves.

Guilty ones - well, obviously internet-based self-abuse; nose-picking; having the evil desire to set off the loudest firework in the world in my street at 3am but thankfully not having the balls to do it and upset my nice neighbours and their pets.
( I_Was_Mordred, Thu 13 Mar 2008, 14:00, Reply)