Series of children's books about the eponymous Horrid Henry, his friends the Purple Hand Gang, his enemies (like teachers, dinner ladies, classmate Moody Margaret) and his family. Has been made into a cartoon series for ITV and a 2011 live action film.The books to date are:
Horrid Henry (1994)
Horrid Henry and the Secret Club (1995)
Horrid Henry Tricks the Tooth Fairy (1996)
Horrid Henry's Nits (1997)
Horrid Henry Gets Rich Quick (1998)
Horrid Henry's Haunted House (1999)
Horrid Henry and the Mummy's Curse (2000)
Horrid Henry's Revenge (2001)
Horrid Henry and the Bogey Babysitter (2002)
Horrid Henry's Stinkbomb (2002)
Horrid Henry's Underpants (2003)
Horrid Henry Meets The Queen (2004)
Horrid Henry and the Mega-Mean Time Machine (2005)
Always Someone Better: In Horrid Henry and the Dinner Guest, Mum's boss, Mr. Mossy, reveals to Henry that he was a lot like him in his childhood and discovered that sooner or later you'll find someone better than yourself.
Big Brother Instinct: Henry has his moments of this towards Peter, despite the above. He once saved him from a falling bookcase, and has taken the blame for him at times.
Brick Joke: In one episode where Henry fakes illness to stay home from school, his mother gets sick too. Since someone arrives to say the water is being shut off, his mother tells him to fill up the bathtub and pots with water before it's all shut off entirely. As Henry is trying to fill up the bathtub with water, the water is shut off. (But he didn't turn the tap off!) At the end of the episode when his dad arrives, it proceeds to get flooded.
Cain and Abel: Henry is the Cain to Peter's Abel but is the Abel to Steve's Cain.
Happy Hippos: "We're happy, we're clappy, we're the Happy Hippos."
Gross Class Zero: "Snot, bogies, fart, poo! We're all sick and so are you!"
Horrid Henry: "It's not fair!"
Chekhov's Gun: In the movie, while the kids are lining up for the talent show, we have a short scene where we are introducted to Vicious Vicky, Sour Susan's little sister, who bites a boy, with narration from Henry explaining who she is. Later on, when Soggy Sid tries to stop the Zero Zombies' performance, Vicious Vicky is let loose on the stage to stop him. She does this by, among other things, biting him on the ass!
Comic Book Time: Not to the extent of The Simpsons or South Park, as the Horrid Henry tv series isn't as much of a Long Runner as them, but although officially its third season hasn't ended yet, it has been running since 2006 and none of the characters have aged a day.
Crossdressing Voices: Lizzie Waterworth and Emma Tate as Henry and Peter receptively in the animated series.
Eyes Always Shut: In "Horrid Henry Reads a Book", Henry decides to make up various "Happy Nappy" stories for the competition to write the most book reports, saying that Miss Battle-Axe can't have read all the books in the world. He makes up stories about Happy Nappies in various places around the world such as Happy Nappies in Germany, Paris, New York, Japan, Australia, and Canada. The Japanese Happy Nappy just happens to have closed eyes.
Gotta Catch 'Em All: Henry and his friends collected Gizmos once, with the Gold Gizmo being the most prized. The Gizmo is the focus of a book story, a TV episode, and an online game, Horrid Henry 2, where Henry has to take all 30 of Peter's Gizmos.
No Fourth Wall: The animated series just completely throws the fourth wall away, with Henry and the other characters constantly addressing and explaining things to the audience. Also broken in the movie, but not as much as the series.
Oh Crap: In one episode where Henry tries to watch a football match even though he has to go to Stuck-Up Steve's birthday party, he resorts to listening to it on a portable radio. The match gets so exciting he accidently knocks the giant birthday cake over Aunt Ruby, when everyone yells "Henry!", the episode ends on Henry: "Oops."
Pet the Dog: When Perfect Peter is having a sleepover, rather than try to sabotage it, Henry actually comes in and decides to have fun with Peter and his guests. Likewise, they legitimately begin to have fun with the sleepover.
See also some episodes where Henry actually looks out for Perfect Peter.