Reporting Who? I M S O Serk
Reason and Proof (screenies, vids, etc): First of all, Nightmare gave all his things away to some players (3 players or something, including me). There was probably a hacker on his account. Then, when I logged back on, I M S O Serk was on the account of Nightmare, pretending to be the real Nightmare and asking back the stuff he gave away saying there was a hacker on his account before. So I gave him some items back, result: he admitted he lied, he said he was I M S O Serk and told me (with some more people around) that he actually even gave a runescape account for the account! Which is rule #20! I have a small picture of it, I hope it's good enough. It's not been photoshopped, I suck at photoshopping, you can check it.

Some players even agree with me he even diserves an ipban!