It has happened to me a couple of times. We crammed a car, and I was stuck in bitch for about an hour with little to no legroom. When I got out of the car my right leg was numb, as was my right ball, left was still legit. You can feel them hang normally, but now imagine that there is a large egg shaped foreign object in your scrote, that's what it feels like. Then when the pins and needles kicked in it was debilitating for 5 minutes.