Batman and Robin (1997)
There are so many reasons that this movie fails that I don't have time to list them all here. The nonsensical plot. The hokey dialogue. The terrible jokes. The day-glo cinematography. The nipples on the batsuit. The shoehorning of too many characters into the film. But perhaps worst was the casting of George Clooney, the coolest actor in recent memory playing the coolest superhero of all time, and this film manages to make both of them look bland and dumb.
Batman and Robin on Blu-ray