Farting in lifts, although, to be honest, I am not sure if it's a "bad" habit, I also need to fart an odd number of times to feel it is a good day...
Pretending to be annoyed by rabid Trotskyites. Who think that their opinions are the only ones to be tolerated.
Daydreaming.
Spanking the monkey. But is that really bad?
Cigarette with a cup of java. So bad, yet delicious.
my addiction to mentos... i'm getting over it though haha
Believing conservatives can become factual.
Smoking, spending too much money, eating fatty food, and masturbating :P
alcohol. Good wine, or real ale.