While there's nothing funny about the subject, as is often the case (IMO) The Simpson's take is extremely good (and very funny).
From The Cartridge Family episode...some brilliant lines.
Homer is looking at the guns. He picks up an unloaded handgun, points it at the clerk, and pulls the trigger several times.
CLERK: Whoa! Careful there, Annie Oakley.
HOMER: I don't have to be careful, I got a gun.
The clerk takes the gun, then holds up several items in succession.
CLERK: Well, you'll probably want the accessory kit. Holster...
HOMER: Oh, yeah.
CLERK: Bandoleer.
HOMER: Baby.
CLERK: Silencer.
HOMER: Mm-hmm.
CLERK: Loudener.
HOMER: Oh...
CLERK: Speed-cocker.
HOMER: Ooh, I like the sound of that!
CLERK: (holding up a huge weapon) And this is for shooting down police helicopters.
HOMER: Oh, I don't need anything like that... yet... Just give me my gun.
He tries to take the gun.
CLERK: I'm sorry, but the law requires a five-day waiting period. We've got to run a background check.
HOMER: Five days? But I'm mad now! I'd kill you if I had my gun.
CLERK: Yeah, well you don't.
Homer walks out of the store, muttering.
The five days have passed. Homer waits impatiently outside the gun store.
HOMER: Come on, come on, open up!
The gun salesman opens the shop, and Homer rushes inside to go to the toilet.
HOMER: Ah! That's the stuff! (He comes back out into the store.) Now, I believe you have some sort of firearm for me.
CLERK: (picking up a large wad of paper) Well, let's see here. According to your background check, you've been in a mental institution...
HOMER: Yeah.
CLERK: Frequent problems with alcohol...
HOMER: Oh heh heh, yeah.
CLERK: You beat up President Bush!
HOMER: Former President.
The clerk stamps the paper.
HOMER: "Potentially dangerous"?
CLERK: Relax, that just limits you to three handguns or less.
HOMER: Woo hoo!