I had to laugh when I read this thread as I used to pull the same trick use the lights on lights off product. Not being abusive but meerly as a joke when I am in a room full of friends. A friend and Mine would go in and take turns turning the lights out and they would turn them on making everyone wonder WTF. A way to counter this is there are also products out there that let alone turn the lights out it also turns them on so if someone comes in and turns the lights out then put yours on and turn them back on. Also, to be able to boot the known person of the Dark room Prank it is designed now that if you click on the persons name click on the block button and there you are able to boot as well. This is also useful now if someone is using the invisibility look. Having to click on the person to boot is not the only option anymore.