I remember when IRC clients and scripts didn't check the given port number (or ip address) when asked to initiate a DCC (Direct Client-to-Client) connection and

I remember when IRC clients and scripts didn't check the given port number (or ip address) when asked to initiate a DCC (Direct Client-to-Client) connection and you could exploit this by sending connection requests to a set of Microsoft's servers that were always up and running chargen with a hefty pipe behind it. If it was a chat the client would either lock up or get flooded off their dial-up connection. If it was a file transfer you could fill up a hard drive reasonably quickly since they were small back then. IRC used to be pretty rough and a lot of fun...