Portable Bluetooth label maker. Not a necessity, but you can use it outside of typical application for lots of fun things!
Somebody park like an asshole? Leave a fun message for them!
Got something you want to personalize? Custom stickers of whatever you want!
Wanna leave memes around in public for people to find? You already have templates saved!
Want to advertise yourself or someone/something else? Boom, instant QR codes.
I've been having fun with the mini I originally got for work, about to buy one that prints larger labels.