Sometimes I need to let someone into my house for them to pick things up or drop things off, I don't want to be there all the time and if they don't have a key I'd like to be able to let them in remotely. I've been able to do this with my garage door and a web UI for a while but I needed something less cumbersome.
I've always wanted a bluetooth NES controller. Nobody seems to share my interest. The few people that did share my interest in a wireless NES controller wanted to go with NFC rather than bluetooth. Must have been either luck or good timing; Adafruit made a Bluetooth HID board so I thought I'd make one myself!