One thing that has yet to be tech'd out, until now, is the mousetrap. Sure, you can use the age old wooden trap that snaps the mouse in half, but that is a little too inhumane.
This project captures a mouse by having a solenoid (electromagnet) drop a bucket over the mouse. The bucket is triggered by the mouse interrupting one of the infrared emitter/detector pairs around the bait. The enclosure that holds the electronics is mounted directly over the bait. Ok, so the "bucket" is actually a semi-clear storage container. The clear container allows a person to see if a mouse was trapped when the container dropped.
Yeah, that is pretty awesome. Now I just need to create a bigger version to trap the ladies. (Just kidding, ladies, I'm not a creep, that's Jason's role.)