Advertising screens
The one that slightly surprised me was on a two-sided advertising screen. One side had a BSOD, which in itself wasn't too surprising. However the other side of the same display was running fine. I can just about understand using a PC to run something which is just a display screen (easier to update content than with a simple TV), but 2 in one box? Surely it would be more sensible to run both screens from the same PC?