Frequently applied by Love, Chunibyo & Other Delusions!'s Yuuta, who is prone to frequently striking his head on the wall whenever he remembers another one of his past rants as a very deluded teen.

In the Land of Leadale: Cayna does this when the innkeeper unknowingly reminds her about an old moniker of hers.

Ichaicha Suru to Okane ga Waichau Futari no Hanashi: When Touma makes him think Haru holding his hand was just a dare, Hojo slams his head on the table in despair.

Mirai Kamiki does this in reaction to her little brother Sekai's obliviousness in episode 4 of Gundam Build Fighters Try.

In Episode 15 of Futari wa Pretty Cure, Rie head-desks in response to one of her husband's crappy jokes.

Danganronpa: The Animation: Monokuma bangs his head against his desk and his chalkboard after Makoto is saved from being executed by Chihiro's AI Alter Ego.

Hilarity Ensues, and when Sanae and Akio start messing with him too, Tomoya does a fast headdesk. She gets extremely drunk off just one bowl/cup and turns into a Clingy Jealous Girl.

In CLANNAD After Story, Nagisa's 20th birthday is also her first time drinking sake (the legal age for drinking in Japan is 20).

Ayakashi Triangle: Whenever Soga finds himself pining after Matsuri romantically, his usual response is to smash his head on the closest wall.

fondness for Mikoto it may also be a case of trying to (ahem) head off Stupid Sexy Flanders. It tends to be her default response to stresses of any nature.

In A Certain Scientific Railgun, when given the idea that Mikoto could contract the stripper lady disease, Kuroko does this.

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