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What's The Most Complex Crime You've Ever Heard Of?

Wow.

True crime is all the more compelling when criminals put a lot of heart and soul into their plans — and some crooks really pay attention to detail.

Perhaps you've heard of the criminals who dug a 40-foot underground tunnel, complete with indoor lighting, to try to sneakily rob a Blockbuster in England in 2007.

They were caught right before their plan went into full effect.

Maybe you know about the tech executive who ripped off Target stores for a year to buy discounted LEGOs, and made a $30,000 profit from them on eBay.

The dude made millions of dollars at work — what was the point?

Or perhaps you've heard of the guy who tried to blackmail Nestlé into giving him millions by sending ransom letters via carrier pigeons.

How did you get ahold of all those pigeons, pal?!?!

Some crimes are so carefully crafted that they're fascinating, so tell us: What's the most complex crime you've ever heard of?

Whether it's a small crime or a major one, tell us in the Dropbox below for a chance to be featured in an upcoming BuzzFeed Community post or video.