Movies that change completely when you add an extra letter

‘Sup
Americal History XL
Backs to the Future
Bi,Robot
Citizen Kanye
Diet Hard
Dude, Where’s my Czar
Ex-Men
Finding Nemoy
Harry Pottery
I love you, Mane
Irony Man
Krill Bill
Look Who’s Stalking
Mrs. & Mrs. Smith
Nightmare on Elmo Street
Shaving Private Ryan
Sitar Wars
The 400-Year Old Virgin
The Da Vinci Chode
The Dark Knight Rinses
The Green Smile
The Hoarse Whisperer
The Humane Centipede
The Men Who Stare at Goatse
The Scat in the Hat
The Thingy
World War Oz