Trolling Wifi Leeches

Wifi-Leeches: Individuals who suck up your bandwidth, causing your movies, and animes to load at slow speeds, and cause your BF3 or MW3 multilayer action to lag. 

At the worst–and far more likely, they’re stealing your identity and watching your activities. After watching your network and identifying the leech, use this trick to flip their browser upside down and let them know you don’t appreciate the intrusion.
Not to mention it makes an epic prank, turning unwanted visitors on your network upside down. Literally. Just have at these links.

Battle with Leeches with Upside down terent
Upside Down Ternet

Have fun ( ^_^)