The only shot I don't like is right in the gum-line when it passes your lip. Luckily, that's only happened once. I wear a balaclava and a woodland bandana around my mouth now because of that. Ripped my lip a bit, left a nice size bump on my gums, and probably knocked a tooth back 2mm. I'd imagine that getting shot on that bone that protrudes on the outer-side of the wrist would fucking sting, too.
Nut shots don't seem that bad. I've been sac'd before by an AEG just pouring at me. Yea, sure, you feel it, but usually any BDU will soften the blow. Then again, that was with .25s. I'd hate to see what kind of damage the testes would take from .36s.
Primary: Custom WE M16A3
Secondary: KWA MP9
Side: Custom WE M1911A1