Can this scammer do something?

hi i went on pennysaver one day to check out free dogs and there was a free yorkie ad and i sent a message to etatisang@yahoo.com and they told me they were from cameroon and i knew this was a scam so i said not interested and the person got pissed of cuz i told them to **** off and leave me alone. and he or she said dont worry i will teach you a lesson i just want to know what can he or she do i mean in this account i dont have personal info only my myspace account and thats it i put my adress fake cuz i dont trust so what can this idiot do to me their email is etatisang@yahoo.com