I've been stung by a wasp a couple of times. The first time wasn't so bad, I just brushed my hand against it and it stung me. The second time though... that was awful. I first leant on the wasp with my elbow, then pushed it into my arm - it stung me twice on the arm, and once on the hand. It's sting actually got stuck in my hand - and this was a wasp, not a bee. I was in a hell of a lot of pain. My arm was swollen and everything. =[

I've been bitten by mosquitos a few times, but nothing too terrible.