@Allie if you mean the big black and white (sometimes pale yellow) ones, those are called Bald Faced Hornets around here, and yes, they can sting the crap out of you. Hurts like Hell. The worst sting I ever had was a paper wasp (the kind that make the upside down cup shaped paper nest) flew behind my glasses and stung me once in the upper eyelid and then once in the lower eyelid. That was NOT a fun day.