Well on a ebil note...since he is using your router, and you ofcourse have access then you can also access HIS pc
just slip a few things in that wont really hurt his pc but will definatly get his attention. fairly easy to do. My neighbor "use" to get on other ppls wireless networks in the neighborhood. one day i watched him attempt to get on mine.
At the time i didnt have anything more than just standard WEP encryption on my router. Since the average user at home ( in a house atleast) isn't going to be targeted for the most part.
Anywho i saw him bust past the wep and then start sucking on my bandwidth so i added a few lil gems to his c drive. One of them was a popup that said he had just D/Led a virus and that all files were now being deleted on his C: drive. it would then display all his files being deleted. they werent really but it was fun knowing he was totally FREAKING out for a lil while lol
I forget the name of the lil program that did it. i dont have it anymore maybe someone on here can remember the name of it. Im sure im not the onlyone here that knows of it. Its damed funny doing to ppl at the office and hearing them try to do the ctrl/alt/del thing over and over