Disturbing episode

Ok, this is my first post. Lurked a couple years or so. A really freaky thing happened to me tonight online and I'm wondering if anyone else has seen anything like this situation. Riled me up enough to get a login to post.

I'm not sure if it is wrong to mention the site this happened on, so don't jump me too badly. I was on 2 tables at Absolute Poker and 2 tables and Party Poker. I was going back and forth and then went on a really bad run on one table at Absolute. If I had good cards, everyone folded, if I had bad cards, eveyone called. I was going to make a sarcastic remark in the chat, but when I looked the word "bubye" was already there.

I don't see how someone could hack one of the online sites, let alone getting past my McAfee privacy wall. I'm no computer expert, but isn't that supposed to block hackers?

Ok, this is part rant and part curiosity on if anyone else has seen anything like this?

Thanks for any replies.