UPDATE:
Coin cell batteries can kill a child if swallowed. It is now mandatory that coin cell batteries be secured behind a secondary layer of protection. This design lacks that protection and it therefore should not be used. See Reese's Law for more information.
The Consumer Product Safety Commission regulation on this topic can be read here. More broadly, almost all simple coin cell holders lack a secondary locking mechanism, so many other products which employ them, even in a standard configuration, are in violation of 16 CFR Part 1263.
I'm leaving the rest of this post up as a notice to anyone who might be searching for similar ideas in the future.
Original post:

Similar to but legally distinct from certain 80's action movie characters, The Santanator is a holly jolly killbot sent back from the future to kill John Connor deliver presents!
This completely non-infringing festive pin celebrates the futility of resistance against the coming AI storm, and features an ominous red eye which (optionally) blinks at a slightly distressing rate of 1.5hz to remind the wearer of just how soon the machines will take over! Extra solder on the front makes the chrome robot stand out, while cutouts in the PCB reveal the battery behind, giving distinct depth to its cold metallic face.
At under 5mm thin, this lightweight and stylish wearable is more than just a way to spread seasonal joy/warnings, it may someday save your life! The unique split-face design might confuse the facial recognition algorithms of any intelligent robots you might encounter, a glitch that might allow enough time to flee.