Sometimes in Happy Tree Friends, something will happen that implies the characters are aware of being fictional characters in a cartoon. This is known as breaking the Fourth Wall. The term "fourth wall" originated from plays in theaters, when actors would look at the audience, talk to them, or do anything else that involved the audience. Because the stage would generally have a wall at the back and both sides, this concept involves the actors becoming involved with the audience who are at the front, which can be considered an invisible wall, making it the fourth one. The Fourth Wall is most often broken in smoochies, but has also been broken in TV episodes.
In Smoochies
Disco Bear Dancing
Pet Smoochie: Cuddles waves at the viewer and says "Hello! h-h-he, h-h-he". (Toothy also did this in his Easter Smoochie)
Valentine Smoochie: Giggles blows a kiss at the viewer(s).
Summer Smoochie: One of Petunia's deaths involves her being crushed by a hose pipe, against the screen, and the screen cracks before she explodes.
Baseball Smoochie: Flaky waves and chuckles nervously to the stranger that's watching her.
BBQ Smoochie: Pop waves his hat and says "Hello there!".
Olympic Smoochie: Mime shows off his strength by pulling an invisible rope.
Halloween Smoochie: Disco Bear dances for the viewer(s).
Party Smoochie: Nutty's car bumps into the sides of the screen.
In TV Episodes
And the Kitchen Sink: When Pop's car lands in the water, it makes a big splash, it can be seen that there is water on the screen sliding and dripping down.
Party Animal: Cuddle's blood stars spreading on the screen, and at the end, the iris closes on Flippy's mouth, cutting off his lips.
Wipe Out: When a wave splashes on Flaky and Cuddles, it can be seen that there is water on the screen sliding and dripping down.
Take a Hike: They hum the HTF theme song at the start of the episode (they also do this in From A to Zoo and the inte
Pop looking at the viewers
rnet episodes This Is Your Knife and Happy Trails) (debatable because could also act as a song written by a happy tree friend in the series).
Wingin' It : Flaky stares at the viewer, when she pops the raft near the end.
Blast from the Past: Cuddles yells, "Oh my God, I'm gonna die! Not this old death again!" This impies that he knew he died in Spin Fun Knowin' Ya.
Mime to Five: Flaky breaks the fourth wall by looking at the viewers before her demise.
A Hole Lotta Love: After the drill machine breaks, Sniffles' and Pop's faces smoosh in front of what appears to be the tv screen.
In Other HTF Works
Milk Pong: When Handy and The Mole send Lumpy through a log-cutting machine, Handy looks at the audience in shock/horror (debatable).
A Sucker for Love: At the beginning of the episode, Pop smiles at the camera.
Disco Bears All: At the shot of Disco Bear in the firelit place with a glass of wine in his hand, Disco Bear is staring at the audience. Although, this wouldn't really count since it's supposed to act like a TV ad.
Stayin' Alive: At the end, Disco Bears is dancing for the audience and gives a growl to the audience.
A Hard Act to Swallow: An ant re-opens the closing iris and cheers at the viewer.
Just Desert Blurb, a Blurb reading "Blurb placed for your protection!" is placed over Lumpy's crotch.
Handy in Milk Pong