I twirl my hair and shake my foot but I never thought of them as "bad habits." People that crack their knuckles drive me to distraction, though. I was told that it gives you fat knuckles. LOL Does it? I don't know.

If I shake my foot while I'm laying in bed, and I sleep alone, would that be considered a bad habit? LOL That's sort of like the question "If a man speaks in the forest and no one hears him, is he still wrong?"

Giving someone a squeeze ball when they crack their knuckles sounds like a capital idea to me!