No fair, SIMON stole my answer...
Yep, I was going to say, Ive have a corn that regurgitates pretty quickly if he gets stressed. She's one of four that are all the same age and size, but for some reason, if i move her around to much within a few hours of feeding, up it comes. None of the others do that with the same treatment. I think some just tend to get a little more stressed. I've also heard that happens if they get backed up, like somethings stuck in there bowels. But im not sure about that,id figure they just wouldnt eat in that case.