Haha, unfortunately, I'm full of "fun" Donald stories. For instance, there was the time I (a 70 Holy Pally) was healing for some guildies in regular Underbog, with a warrior tank who had never equipped a ranged weapon in his life. Or the time I tried running Shadow Labyrinth with not one, but two prot-specced warriors who were dual wielding.
Though the best series of Donald stories starts with the time in Black Morass when I was getting Kara keyed in a PuG, and the rogue who was there for the same thing prematurely started the event while we were clearing the trash, then insisted on tagging adds even when the T5-geared lock who was nice enough to come help us out told him time and again to stick on the elites and leave the adds to her. After we wiped and he was asked whether he was even reading party chat, he answered, "No." After much arguing, he finally understood what he needed to do, the lock replaced the Kara/ZA-geared hunter we had that got fed up and left, and we completed it without too terribly much trouble.
Then, my guild's Kara run that week got canceled, so I found a PuG to join to begin getting experience on some of the fights. It turned out to be a real good PuG, dropping every boss except Shade, Nightbane, and Netherspite (skipped since we didn't have much time before people had to leave), but halfway through, one of our dps had to leave, and who was brought in? Yepp, the same rogue from BM. On Curator, he was almost never on flares even though he was told repeatedly over WoW chat (*gags*) to stay on them (fortunately the rest of our dps could handle them), and on Prince, he got one-shot almost immediately because he didn't give the tank time to build aggro, so we essentially downed him nine-manned. Good times. ^^