People smacking their gum, especially if they do so LOUDLY! I know a woman who cannot chew gum without it making a little cracking sound every time she bites down. How the hell does she do that? And then others just chew with their mouth wide open.
My daughter learned that if she is chewing gum and I put my hand out, palm up, I want her to spit it out because she is smacking.
Even thinking about it is driving me bonkers.
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