Know someone with a weird bad habit?

Some of us have 'em or we at least know one person with a bizarre bad habit that drives someone crazy! For example, do you bite your nails...your toenails? Are you an adult that still sucks your thumb? Do you love chocolate milk so much that you have to have it with every single meal? Do you know someone who wears all green...every single day? Does your friend like baby food so much that she eats it with her baby for dinner? If you or someone you love has a weird bad habit/behavior that's driving you bonkers, we want to hear from you!