Fun story (at least I think so):

About 20 years ago we used to play BZFlag in the office during lunch, maybe 6-8 of us in a company of ~50. Someone complained that we were using up the network bandwidth, although I knew the BW for the game was tiny. I bought a bunch of USB Wi-Fi adapters from Woot! and we would place them on the tops of the cubicle walls when we played. We wouldn't actually plug them in. We played on and off for several more years without any network complaints. I even built a map of the office, taking pics to use as textures, so we could drive tanks around the office, jump on our desks and shoot each other.