You could always perform a little ARP poisoning attack and, for instance, send them to some porn site every time they want to go to Google. Of course, there are much more dangerous things you can do with ARP poisoning, which I refuse to go into. I believe you should be a good neighbor and let them know about their mistake.
On a lighter note, you could always send documents to their printer. That always freaks my neighbors out...
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If you're flammable and have legs, you are never blocking a fire exit. - Mitch Hedberg
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