Went to an appt. where the doctor had a piece of gum planted between her teeth so hard that it gave her a lisp as she spoke.
At first, I thought she had a speech impediment, but the I saw the gum. She was not smacking it, not even chewing it, but was speaking to me through almost clenched teeth.
I admit that it took me off guard, since I work at a school where no gum is allowed (trash, smells, wrappers, gum residue, sharing issues)
As for the OP's concern, it was a lunch table, so I would expect the sound of chewing. Since it is supposed to be a new person each time, just move while saying, "I already sat with you, maybe next time, gotta follow policy!"
Oh, wait, it was after lunch. Maybe she was 'brushing" her teeth with the gum? For fresh breath? I dunno. grin and bear it?