LOL Alicat! I totally agree on the fingernail clipping. My aunt always cleans her nails when she's finished eating. God help anyone who hasn't finished yet...
Well, body odour is bad. Be it from not putting on deodorant, not showering, bad breath, they're all awful. And eating with your mouth open, or even just exceptionally loud eating. I know someone who manages to crunch soup. Turns my stomach
