With all the wirework, costumes and green screen action in "Oz the Great and Powerful," there was a lot that could go wrong on set.

And thanks to a sneak peek at the movie's blooper reel, we can finally see some of the unscripted accidents!

While the full gag reel will be released when the movie lands on Blu-ray and DVD on June 11, check out the preview above -- and see what had Mila Kunis cracking up over ... and over ... and over again!

WARNING: If you haven't see the movie yet, there are some spoilers regarding the identity of the Wicked Witch.

Proceed with caution!

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