Most ridiculous thing you have given an IP address to?
Ours has to be when we got a phone call from a guy telling us he was coming in to network the windows in the new building we are having built. We thought this must have been a prank call, but sure enough when we went over to the building all the window frames had a NIC and cables had been run in the inner wall.
So after a few months of laughing about about it we finally say them in action and each window has an IP address on a subnet and a central server bolted to the wall in our comms room. The Co2 sensors detect Co2 and opens the windows if it goes over a certain amount. A certain temperature opens the windows, and due to the position of the sun the windows darken.
All we can think of is this is such an unneccessary waste of money.