Guns and beer, always a fun combo. I think proper etiquette would be to
anchor in the back if firing off the stern unless you want to pick off some bottles placed on the spreaders of another
boat (very fun, btw).
I've also discovered that using bottles is really the way to go, they provide a very satisfying "pow" when you connect and
aluminum cans tend to float unless you blast them again after hitting the
water. All those cans floating around is really bad form.