I'm definitely a supporter of dental hygiene ... but in the privacy of your bathroom. PLEASE!
Yes, I've seen a woman literally give herself a full-on manicure -- nail clippings everywhere.
No better way to start your morning than being covered in someone else's chin hair.
You can pick your friends, you can pick your friend's nose, but you shouldn't pick your own nose in public. Period.
I understand it's normal to get a little sleepy from time to time, but if you know that you snore at fog-horn level, maybe you shouldn't allow yourself to doze off in public. Just a thought.