You may cut internet access any device connected to a local network as long as it is hardwired resulting to increase ur bandwidth simultanieously.
You may try this in cybercafe, collage computer lab and make others exited.
For this trick you just have to download a software called netcut.
After download just extract the software and install it.
Now double click on netcut icon on ur desktop n a window will pop -out showing u connected routers.
Now Just toggle to the computer which u want to cut off
Download this software from here.