the story may be true
this was shown on the mtv show jackass. Steve-o, one of the craziest guys on it, swallowed a goldfish, and then, forced himself to throw up, and up came the goldfish unharmed. (as you can tell, i watch they stupid shows often) the difference though is that a goldfish doesnt have the spiked fin on its back like a bluegill does, that must have been the cause of the problem for this guy if the story is true.