My unofficial forum survival guide actually covers this one:
1. Everyone that will ever consider robbing you is a 250 lb bodybuilding crackhead with an insatiable thirst for blood and damn near bulletproof skin. Only semi auto bullets starting with a .4, revolver calibers containing the word magnum, or 12 guage shotguns will do for defense.
2. All firearms are bought for the purpose of defense or SHTF situations. Even if you specifically state that it is for target practice (aka plinking), somebody will bring up tactical use, concealed carry, and "stopping power" at some point in the thread.
3. Zombies are no joke, it can and WILL eventually happen. You're either prepared or you're undead, pick one.
4. Will this caliber kill (insert animal) will result in answers about grizzly bears or drug addicts. It is inevitable.
5. Zinc guns will not last 1k rounds before flying apart and blowing off your hand. Everyone has had a buddy who knew a guy who had an uncle that blew his hand off with a J22 and can now only drive an automatic.
6. If you don't know about something, fake it till you make it.
7. Almost everyone around here can shoot the ass off of a fly at 100 yards firing offhand during a blizzard that came during a freak sandstorm.