Yeah; I used to use that shit all the time when I was on AOL. I never harmed anyone, though. I would just browse around, look at shit, then let them know whats up and de-infect them. I used to do a lot of crazy shit back in the day. I would use PWS (Password Stealers) that were in .shs format and mass mail thousands of people and tell them it was an aol "Fader" (remember those?). Once they ran it, it would send their AOL password to my hotmail account. I ended up canceling my own AOL account and used these peoples accounts, I had over a thousand screen names at one point. I would just log on the master account and create my own name.
I also used to jack peoples credit cards. You take a file with an .htt format, hex it with the proper html tags, and mass IM people telling them their account is suspect to cancelation, and they must visit the site to remedy the problem. Once they visit the site (that is linked to the .htt file) and fill out the forms, I would have their shit. I had several hundred credit cards at one point, but I gave most of them away because two people I used to do it with got caught up by the feds (both on seperate occasions).
That was many moons ago, I moved on to unix and intruding bigger systems, like universities and high-end websites using various exploitations and vulnerabilities within .C programming. That was the fun stuff, if you want to really get into hacking, learn unix! As of now I don't do any of this shit anymore. There is really no limit to the things I messed with, I knew people on the internet that you read about on the news, some unbeleivable shit.