So we were organizing an IoT hackathon and wanted to build something cool to show off to the participants, so we had this thing where if people would tweet about our hackathon, they would automatically be sent a code via a DM for a vending machine that we built from scratch (carpentry, electronics, everything) and they would get goodies upon entering their code! :D

We unveiled this machine at midnight when the participants were beginning to get sleepy so that they would have something to keep them awake. Instant success! We got tired of refilling the machine ran out of goodies stock even though we had plenty!

(The goodies ended up being only chocolates due to budget reasons :P)