Sometimes I like to put up worthless junk in the AH just to see if it sells. I don't even care if I lose money on it putting it up over and over. It's that satisfaction I get when someone buys some worthless junk I'm selling. My best story would have to be some jagged arrows my warrior had in her possession after taking a year off of WOW. Obviously ammo is no longer part of the game, but it was in my inventory of my long time inactive character. I had to re-list it once, but it sold. I think I only put it up for a couple of silver, but the satisfaction was in that it sold.
I tried to sell the ammo of my Orc Hunter (frostbite ammo), but I haven't had any luck so far, but I'll keep trying. One thing I'm curious about, is what happened to my ammo bag. I think during the patch that removed ammo, my ammo bag converted into a regular bag. Anyone know anything about this?
Occasionally I might put up white items, but they usually don't sell. I always put up the double mail coif (a grey item), but that grey item actually has some use. It's the first mail helmet available. It still took me two tries to sell the last one I picked up, however.
I'd love to sell my bag of marbles, but it's soulbound unfortunately. All my alliance characters still own their marbles if they quested in Westfall.
I'd like to hear your stories of worthless junk you have sold in the AH.