In all seriousness, I have this issue myself. I don't think I've ever had a nut actually fall out, but I have problems with bits shearing around while wearing tight briefs. I don't like boxers any more, because I don't need my nuts swinging against my thigh, either.
C-IN2 makes some great supportive trunks with plenty of room for your junk, and so does Calvin Klein (but watch your cuts, not all Calvins are the same). American Apparel also makes a baby rib brief that's surprisingly comfortable. I've also got a couple of pairs of Baskit brand briefs and jocks, which run a little tight, but don't seem to have "escape" issues like other tight underwear.
Unfortunately, you have to buy quality underwear for quality comfort. Nothing that they sell at Target or Kohl's is going to give great support for more, um, challenging anatomy.
Also, we need pix, like Cash said.