Ocean's Eleven is a fiction, but big casino heists do happen! Here's a list of most interesting of them:

Easy as pie

In 1992, cashier at Stardust casino in Vegas went on a usual lunch break. The trick is his bag was stuffed with casino chips and cash - $500,000 overall. FBI searched all over the US for him, but he’s never been caught. There’s a rumor that his accomplice killed him and got all the money. But we’ll never know the truth.

Bonnie and Clyde