My wifi is/was tapped

I want to have a little fun.

Can I send these illegal wifi accessers a nasty message or gain access to their drives. I dont want to do anything really nasty, I just want to send them a message or a link that will scare the S#$% out of them.

I recently have been playing around with them since I am hardwired most of the time. I turn on wifi occasionally just long enough for them to log on then cut them off.

I know how to access their mac addresses and have their ip addesses assigned by my router but dont know what to do next. I assume since they are logged into the network I also have access to their drives too.

C:\Documents and Settings\All Users\Start Menu\Programs can you see this folder, why not drop a little notepad message in there and when they restart comp it will pop up

I always like printing stuff on other people's computer

Check to see if they have any printers shared