I have held a roo upside down before but not dunked it. I think that may kill it if you are not careful. Holding them upside down is kind of a last resort because it compresses their lungs and they can't breathe. I heard my roo rasp a little when he was upside down, but it did the trick and I turned him back the right way and carried him around until he got too heavy. He hasn't pulled his garbage with me since. Grabbing them by the comb or wattles while holding them helps too. My roo forgets about once a week and stomps his feet at me or rushes the wire after I have walked out. I don't let this pass! I go back in and chase him down and pick him up and grab his comb so he remembers who is boss. He is getting better about it all the time.