So I just got back to school and some of my friends seriously pranked me earlier today. Anyways, I really want to get them back, preferably in some manner with their computers. However, its unlikely I can ever get into their rooms without them there, so I was hoping some people might have some ideas on ways I can find things like their ip address on the network and how i might just prank them so they come crying to me there more tech oriented friend. Preferably things that would just annoy them, but not cause any permanent or serious harm to any computers, just prank them. Thanks for any ideas in advance