Occasionally, after many, many beers, my friend and I will wind up doing this. Generally the first one is unintentional, but interpreted as a kind of challenge.
We generally don’t have enough, erm, ammo to really carry it more than a couple of rounds. So far, I’ve been relatively undefeated, with my friend giving up and running in the other room in disgust when I try to squeeze out one last entry, but have it wind up sounding like a sickening gurgling noise instead of a more conventional-sounding poot.
Sierra Nevada Pale Ale (or other krausened ales), in bottles, lots…
If I go to bed after drinking a sixpack of Sierra Nevada, I wake up the following morning with enough gas in my bowels to blow an entire stanza of reville on the butt trumpet… That stuff’s amazing.