I Just Shot Marvin in the Face/Playing With

Basic Trope: Character fails gun safety forever and winds up shooting someone.
 * Straight: Alice casually points her pistol at Bob while talking to him, then the gun goes off and he gets shot.
 * Exaggerated: Alice uses the barrel of her pistol to scratch her nose and blows her nose off.
 * Or worse, Alice is way, way, way Too Dumb to Live and attempts to pick her teeth with the trigger.
 * Justified: Alice has no idea what a gun is and accidentally shoots someone.
 * Subverted: Alice waves her gun around carelessly, it goes off, but then explains that it's just a suction dart gun.
 * Double Subverted: Alice got her suction dart pistol mixed up with her real pistol.
 * Parodied: Alice carelessly waves around a super soaker. It goes off like a real gun.
 * Deconstructed: Alice accidentally fires her pistol, and either shoots or narrowly misses Bob. The mood of the scene emphasizes that this is a very serious problem; it leaves Bob in shock and traumatizes to Alice, and leaves any bystanders either way as well.
 * Reconstructed: Alice narrowly misses Bob, who promptly educates her in gun safety.
 * Zig Zagged: Alice catches herself pointing her pistol at Bob and hastily corrects herself, explaining that even though it's a suction dart gun, she shouldn't get sloppy. Turns out it's a real gun, which she finds out when she deliberately fires at a target. Bob is standing behind the target.
 * Enforced: The film is a comedy, and Alice's ineptitude with guns is a Running Gag.
 * Conversed: "I can't believe she's just waving it around like that. Five bucks says she shoots Bob in the face."

"Oh my God, I Just Short Marvin In Th-BLAM!"