Dark Green

Dark Green is an episode of Happy Tree Friends, the episode revolves around Flippy and Artie as they take a walk in the park, but when Sniffles lights a firecracker to test an experiment, Flippy hears the *pop pop* sounds and flips out, and disappears from sight of Artie.

When Fliqpy finds Sniffles and holds him over the firecracker, causing his head to burn and explode, Artie continues looking for Flippy, Fliqpy then proceeds to pull out a knife, pin Cuddles against a tree, and carve open his stomach and pulls out his heart. After seeing this massive massacre, Artie goes insane and proceeds to stalk Fliqpy.

Fliqpy then finds Giggles and uses his traps to push Giggles into a hole, then pushes a rock down the hole, crushing Giggles, afterwards Fliqpy gets the idea he's being watched, and after he realizes, Artie jumps out and lands on top of Fliqpy, attacking him with his "bear" hands.

Then Fliqpy throws Artie towards the tree and accidentally pins Flaky to the tree because her quills penetrated the bark, then Artie jumps towards Flippy and twists over a knife that Fliqpy threw, and after that, the knife flies and stabs Flaky in the head.

During the final showdown against Fliqpy and Artie, Nutty is skipping through the park, and Fliqpy runs at him and grabs Nutty, smashing him across Artie's face, this, of course, kills Nutty, causing Artie to gain a broken nose and a lazy eye, afterwards Artie throws a smoke bomb and runs off from Fliqpy's sight, eventually jumping from behind and stabbing Fliqpy in the side, Fliqpy throws a knife behind him, but Artie does a back flip and dodges it.

Then Artie uses his Glock 19 to shoot Fliqpy in the head, stomach, and legs, only it doesn't kill Fliqpy, eventually Fliqpy dies from another blow to the head, and Artie snaps back into reality, only to realize he killed Fliqpy, Artie then remembers he can't see in one eye and his nose hurts, then he runs out of the park and the episode ends.

Moral
The moral was in the episode, Everyone has a dark side.