Didn't someone hack the GO train's LED "next station" boards once? I seem to remember those were Bluetooth, or maybe it was WiFi...?
Unsure ... but that's hilarious. Still could affect people's jobs - just think 1 poor soul gets fired for being late just 1 more time and didn't take a picture to prove it wasn't his/her fault. Some places even in North America operate just like a sweatshop.