Harry Potter Gone Wild
That’s what you think. They used to lave 100-pound notes, but she built a house out of the ones she didn’t use to wipe her ass, and now there aren’t any left.
Harriet Potter and the Successful Sex Change
*Harry Potter & the Giant Peach
Harry Potter & the Chocolate Frog Factory
Harry Potter & the Indians
Harry Potter & the Autistic Kid With a Snow Globe
Harry Potter & The Repressed Memories of Dumbledore’s “Special Wand”
Harry Potter & The Gina Lollabrigida Film Festival
Harry Potter & The Trolls of South Beach
Harry Potter & The Old Jewish Woman Go To Nashville
Harry Potter & the Anti-Climax
Harry Potter & the Humpy Rottweiler Prince
Harry Potter & the insurance Adjustor of Geico
Let’s see here …
Harry Potter and the Humorous Reference to Some other Work of Fiction
Harry Potter and the Humorous Reference to Some Historical Event
Harry Potter and the Humorous Reference to Anything Else from Pop Culture
Harry Potter and the Humorous Reference to Some Currently Divisive Issue
Harry Potter and the Humorous Reference to the Story Arc of the Harry Potter Series
Harry Potter and the Humorous Reference to the Fact That Harry Potter is A Book Series
Harry Potter and the Humorous Reference to J.K. Rowling Being Rich
Harry Potter and the Humorous Reference to Stereotypical Adolescent Behavior
Harry Potter and the Humorous Reference to Sex
Harry Potter and the Humorous Reference to An SDMB Meme
Did I miss any? 
Harry Potter and The Kleenex of Shame
Hogwarts on the Weasly - Hermione’s Denial
And yet, the thread is still going…
Harry Potter Gives Up Magic In Favor Of Magic: The Gathering
(And It Turns Out He’s Not Very Good At It)
Harry Potter And The Other Half-Blood Prince
Are You There God? It’s Me, Harry.
Harry Potter & The Greased-Up Naked Deaf Guy.
Harry Potter vs Batman.
Harry Potter and the non-sequitur.
Alternative title(USA) Harry Potter and the really fucking enormous chair.
Harry Potter and his Buns of Steel
Harry Potter and the Absurd Imam
Harry Potter Does Dallas
Harry Potter and the Union Gap
Harry Potter and the Oppressive Project Deadline
Harry Potter and the HP Sauce
Harry Potter and the Potheads
Harry Potter and Those Wacky Canadians
Harry Potter and the Additive Conjunction, Definite Article
How about “the humorous left turn into a band name,” aka Harry Potter and the Comets?
Mr. S submits:
Harry Potter Goes to Hell (oh wait, that was Jason)
Harry Potter Comes Back From Hell, & Brings Postcards, Snapshots & Slides, As Well As A Lovely Embroidered Pillow For Scarlett67.
…and pie
Harry Potter Hari Kiri
I prefer Harry Potter and the Pips.
All Your Harry Potter Titles Are Belong To Us