I also do this, but I try to not let people know I'm observing them. Also, nothing I've said so far has been a guilty pleasure really but to add more to this list After watching a movie, I watch it again with directors commentary haha. Porn, a bit of country music.
Oh, and coffee, too. Caffeine in general. Guilty, because I often spend time I need to spend rushing to school/wherever on a quick run to the nearest coffee shop, and then I usually end up doing the walk of shame wherever I needed to go with a cup of coffee in hand.
This is what inspires my coffee-runs. I kind of do them before I have the chance to withdraw. I'm very preparedpants.
Brazilian Jiu Jitsu is definitely the ultimate guilty pleasure for me but only when I start skipping social events to go to class or when I'm really sore or injured and still find myself going to class.
Can they really do anything about that, though? Caffeine isn't really a guilty pleasure for me, so much as a necessity. I get massively debilitating headaches if I go without it for more than an hour or two. Yeah, I'm an addict.
You like to break things? I like to take things apart and I really like the sound when things are thrown against a wall, it sounds rather silly but it's really quire interesting. And I like fire... and candles.. and fire... and explosions.
Selena Gomez is win. I don't know if this would qualify as a guilty pleasure or not, but I seem to have developed a strange fascination with Page 3 models. Not just Page 3, but that sort of thing.
I just realised I do have one genuine guilty pleasure: The Notebook. also, most other soppy romance films ever made.