Like over-the-top outfits and gushing acceptance speeches, shocking nomination snubs are part of the tradition of the Oscars.

We've rounded up some of the best performances that never even made it to the big show below.

Judy Garland, "The Wizard of Oz" (1939)

This beloved film was a box office bomb when first released, so perhaps its not so surprising that Judy Garland wasn't recognized for her timeless performance as the homesick Dorothy.

Ingrid Bergman, "Casablanca" (1942)

While the film received 8 nominations, including a "Best Actor" nod for Humphrey Bogart, Ingrid Bergman was overlooked as Ilsa Lund in this romantic drama.

Marilyn Monroe, "Some Like It Hot" (1959)

The blonde bombshell, as singer "Sugar Kane," attracted the affections of both Tony Curtis and Jack Lemmon in this legendary comedy. But she couldn't catch Oscar's eye.

Jimmy Stewart, "Vertigo" (1958)

Hitchcock's masterpiece was nominated in just two technical categories. Hitchcock blamed the film's failure on the age of its star Jimmy Stewart -- he felt that the 50-year-old wasn't a convincing love interest for the much younger Kim Novak. Apparently, the Academy agreed.

Malcolm McDowell, A Clockwork Orange (1971)

This dark, somewhat disturbing film with its violent themes, created its share of controversy, not the least of which was the exclusion of star Malcolm McDowell from the Best Actor list.

Leonardo DiCaprio for "Titanic"

This Hollywood epic was one of the most expensive films ever made, with a budget of 200 million. But money couldn't buy a nomination for the film's male co-star Leonardo Dicaprio, despite the film receiving 14 total nominations.

Here' are the biggest snubs of this year:

MARK WAHLBERG,  Best Actor,  "The Fighter" (His co-stars CHRISTIAN BALE, AMY ADAMS and MELISSA LEO all got nominated.)

ANDREW GARFIELD,  Best Actor,  "The Social Network" (Some people think JUSTIN TIMBERLAKE should have gotten one, too.  JESSE EISENBERG did get recognized in the Best Actor category.)

"Burlesque", in any music categories

MILA KUNIS,  Best Supporting Actress,  "Black Swan" (Co-Star NATALIE PORTMAN was nominated for Best Actress)

LEONARDO DICAPRIO,  Best Actor,  "Inception" or "Shutter Island"

"Despicable Me",  Best Animated Feature

RYAN GOSLING,  Best Actor,  "Blue Valentine" (His co-star MICHELLE WILLIAMS was nominated)

JULIANNE MOORE,  Best Actress,  "The Kids Are All Right" ( Her co-stars ANNETTE BENING and MARK RUFFALO were both nominated.)