Calling the Geeks to Answer a Question

While at Disney, I have free internet access. I am getting more hits from random people trying to tcp to me or see if I have a web service running and the like. Is there any easy way to annoy them without giving up my info? It's been 6 years since I have tried any hard core devilment and I can't drudge anything out of my mind. I have a firewall going which is what is stopping them, and of course it gives me their ip address. There ought to be something I can do to annoy them back. ;-) Any ideas?