When I was in the dentist they said "Be careful you don't bite your lip as it is numb", I thought "No problem I didn't bite my lip last time", then later I found my teeth right in my lip, ah, I did bite it then. Oh, I can't wait until the numbness wears off and my f*c*in' lip hurts
And phew, it is feelable now and hurts a bit but not too much