You've basically covered it.
Make some kind of outrageous 'maybe if you weren't a nonce' type post at someone.
Then link to a post which makes them look a bit creepy.
( Amorous Badger NAKED BEA ARTHUR PHOTOS 4U, Fri 20 May 2011, 14:14, 1 reply)

You do have an advantage though
keeping an archive and that.
( sandettie light vessel automatic New Twitter - @bollocksreally, Fri 20 May 2011, 14:25, closed)

Oh and carefully targeted deliberate stupidity/misunderstanding on your part can work a treat.
I once wound up some bloke to the point where he was making Internet Death Threats. He stated that he's love to punch me.
Eventually.
He was so upset he forgot to check what he was keymashing in and wrote 'id love punch you at you'rr house ne day of the week'.

I told him I was flattered but didn't enjoy fisting. And then had to tell him what fisting was.
By this point he'd copped on to his mistake and edited his post. Which I'd screencapped.
( Amorous Badger NAKED BEA ARTHUR PHOTOS 4U, Fri 20 May 2011, 15:58, closed)