In the Futurama episode "How Hermes Requisitioned His Groove Back", Bender is dealing a hand of poker and accidentally clips off some of Fry's hair with a wildly thrown card.
In Bender's Big Score, Bender belches, setting Amy's uncharacteristically long hair on fire — causing it to go back to the style she had it in during the series.
In The Simpsons episode "Itchy and Scratchy Land," Homer repeatedly ducks the cleaver of a mad robot while insisting that nothing is wrong, but loses the two hairs on top of his head when it gets too close ("Ah! My hair! Oh god, I'm ugly!").
At least one episode of Looney Tunes in which Yosemite Sam confronts Bugs Bunny culminates in Bugs using a trick shot that not only parts Sam's hair but splits his hat, as well.
An episode of Jimmy Two-Shoes had Lucius sending Jimmy and Heloise on a roller coaster that consisted, in part, of several giant meat clevers that would chop them to bits. They were spaced so poorly that they only succeeded in chopping of Jimmy's hair.
An episode of The Fairly Oddparents had Timmy's Yoo Doo doll about to be put into a wood chipper. By the time he gets Cosmo and Wanda to unwish the dolls, the shredder has shaved his hair.
In another episode in which he wishes that he and Trixie were the last people on earth, near the end Trixie has gone insane and tries to kill Timmy with a helicopter just before he wishes the world back to normal she has managed to cut off some of his hair with the helicopter blades.
In the The Avengers: Earth's Mightiest Heroes episode "Widow's Sting" Hawkeye is about to shoot Black Widow with an arrow, but then spots Madame Viper behind her about to shoot Mockingbird. He instead shoots the gun out of Viper's hand, but on the way it passes through Natasha's hair, cutting a few strands.
In the Samurai Jack episode "Jack vs Mad Jack" during their fight Evil Jack slices off his trademark topknot hair, he then does the same to him.
In the Courage the Cowardly Dog episode "The Ride of the Valkyries" after being mistaken for their sister the Valkyries give Muriel a battle axe as she playfully fools around with it she accidentally cuts off some of Courage's fur on his head.
Rambo in his 1980's cartoon was often seen ducking for cover right when the enemy fires at him, just fast enough for the bullets to slice a few locks of hair from his head. The man had the Devil's luck, one has to admit.
In My Little Pony: Friendship Is Magic episode "Secret of my Excess" this happened twice - first time when Spike accidentally burns the doctor's hair off with his breath, another time when the Wonderbolts slashed the crest on his head off.
Spike gives another one to Twilight in It's About Time, resulting in the haircut Future Twilight had.
In the Tom and Jerry short "Mouse Trouble", a gunshot leaves Tom bald, and he has to wear a Dodgy Toupee for the rest of the cartoon.
In episode 16 of Symbionic Titan, when Lance is in the middle of a sword duel with a traitor, the traitor clips a few hairs with an attack that Lance barely dodges.