It can follow light sources via adaptive motor orientation, which may not seem that impressive, but let me reiterate: 10 dollars.
I've seen people who have kludged bikes, air conditioning units, computers, and even full automobiles. Never though have I seen a man who has kludged an entire property.
That man is Vince Hannemann, or as filmmaker Evan Burns calls him, the Junk King. Check out the video, and feast your eyes on a personal temple built entirely out of old crap. It's a kludge kathedral, Notre Dump, Angkor Wat with extra "wat." It's passion that could easily be mistaken for pathology, but I will say this: if the latter is true, then he is the coolest damn hoarder I've ever seen.
This Indonesian dentist is well aware of the fact that dental drills can be a little bit... err... intimidating. So, he created a drill that, instead of making the typical whirring and buzzing noises a drill makes, plays audio of the patient's favorite songs from an MP3 player. Nothing like a little Gangnam Style to ease the nervousness of having a whizzing metal object shoved into your mouth (no, don't even go there...).