The ultimate AFK (so far) in my WoW career happened while we were on Illidan last week. Uly, a good Mage in our guild, was standing with the ranged group dpsing Illidan during phase 1. He was a little high on threat, so he switched to his wand. Nothing wrong there.
So he's standing there, wanding away as I'm moving Illidan across the terrace to avoid the fire. It looks like he's doing his job. He get the parasites.
"Uly," the raid leader calls out.
A second goes by.
"Uly, move," calls the class lead.
"Oh $!@# he's AFK."