The only things i can think of, is either:
1. THey wanted to register, your nick was already in use, so they tried to get the password for it. (either out of ignorance / stupidity/ click happy), or they KNEW what they were doing, and thought they could jump the system.
2. ITs someone that has been here before, and either made BAD enemies here (probably due to attitude), or got banned, so now they trying to get back in, but as someone already on the forum... in which case you will have a split personality / evil twin.
But i am glad it didnt get to that point <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />