The Tentacle Dildo
This post doesn't involve motors or circuits or technology at all, really. However, I know that unlike myself, many of my readers actually have other interests and hobbies. So for those of you wacky otaku out there that just can't get enough tentacle rape through video form, now you can live it! Just remember to use protection.
Also, if you don't mind that "I will never be able to unsee this but I'll take a brilo pad to my eyes anyways" feeling, poke around the ZooFur site a bit. It'll give you ideas, like, say, Alternative weapons for your next Flash Mob Pillow Fight. It's also great for party games like "How the hell do you get that in THERE?"