Lies
Steals
Mooches
Interrupts others when they are speaking
Acts like a know it all, but don't know anything
Acts conceited (when you're really confident - there's no need)
Says "I'm grown" (if you really think so - there wouldn't be a need to announce it)
Looks at my name, presumes I am another ethnicity, then has the nerve to say it (Oh... I've never met a black ___ before).
*When I used to work at night - calls in the morning, and when I say that I am asleep exclaims "Dang, you sleep all day...." (You would too if you just fell asleep at 6am).