Some things I wished I had the means to make...

Smallest working V12 engine:
[ame="http://www.youtube.com/watch?v=mutb7KgA9NM"]YouTube - V 12 Modellmotor RC Engine[/ame]

Lego (electric) Twin-Cam 32-valve V8 engine:
[ame="http://www.youtube.com/watch?v=Z8ut5ND3agI"]YouTube - Working Lego V8, 32 valve engine[/ame]

Lego, when I was boy, is the toy we played with when we were grounded. Well, apparently, they're not for wimps anymore.