Think back on the coolest LEGO creation you ever made when you were a kid. Maybe it was a tower, or a colorful White House, or a robot that broke the second you tried to make it move. If you were lucky, you got your hands on a LEGO Star Wars kit so you could make a decent looking TIE fighter or something. Our point is, whatever your proudest LEGO creation was, it's going to look like a crap mountain compared to ...

7 A V-8 Engine (That Runs)

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OK, that looks like it would be a pain in the ass to make even if it was just intended to look like a V-8 engine made out of LEGOs. But this sucker has all the moving parts, including pistons and a drive train, and clocks an impressive 1,500 rpms. Watch it in action, it's insane:

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You can make one yourself, if you like -- all you need is about $400 and to devote about an hour a night to the project for, oh, the next year or so.

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He's working on a Maserati, but the LEGO airbags present a real challenge.

This is the work of Dutch LEGO nut Barry Bosman, and all it took was 2,862 parts, 300 hours, and far too much patience for a regular human. Oh, and it runs on air, if you were wondering how you combust gasoline in something like that without it exploding into a mass of molten plastic.