Vanilla, yes i know it's boring =p.
I don't think I can pick just one... Killing a semi famous pvper in a one on one. No one else had been able to beat / catch him. Breaking up Hydra Alliance blob camps with a small gang of plate tanked ships, guardians, and alts. Some of the people that I am still in contact with after a decade.
Accept that any ship you purchase is already lost. It is not a matter of if, it's a matter of when...