Chewed my nails.
Chewed my lips(still do)
One time I found out I could blow bubbles with my spit so ended up doing that for like 2 months.
English
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I remember people doing that in school and I would feel like vomiting every time.
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Never did any of that in public though. I remember standing next to a guy at the grocery store who was cracking his knuckles which caused the cashier to vomit.
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You are not alone with the spit bubbles. They provided many hours of amusement.