What is your weirdest habit?

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Everyone is bound to have a habit, whether it is weird, good or bad.. I have observed a lot of people with weird habits, like this friend of mine, he puts his hands inside his pants and scratches his butt cheeks, i always catch him doing this so one time, i asked him if he had some sort of disease, he said, he had none, it's not even itchy, it's just his hobby to scratch his butt every once in a while.. (weird...) this this professor of ours, he would put his hands in his pocket and touch his "thing" (it's obvious, duh..our teachers have their polos tucked in their pants).. all of us students find him pervert because he would do this even when his lecturing.. then one time during his lectures, he finally shared to us why he does it, it actually became his hobby ever since he had a dream that he lost his "thing" so he would touch it every once in a while to check if it is still there.. heheh (weird...) me, i have this habit of pinching my nose, i don't know why but i just loooove pinching my nose, i would only stop when my nose is all bruised.. yup, i know, it's weird.. what about you, what's your weirdest habit?