Ok.
So.
It is a glitch.
(SAVE BEFORE YOU DO THIS!)
And here is how to do it:
Equip more than 1 arrows.
Attack with a sword, and while your in the middle of the attack, go to your journal.
Like, MIDDLE of the attack, not right after. Try and unequip the arrows. DON'T DROP THEM. When it tells you you can't, just to make sure you can do this find something that doesn't have much value in your inventory right now. Nothing enchanted. Ok, so drop it, and leave your inventory.
It should drop like, 7 or 8 of them.
Then you can pick them all up, and do it again with just about anything. Found a black soul gem? Do it 3498639476384 times.
But if you just did it, don't try and drop the same item again if you have like 5+ in your inventory, it won't work. To remedy that, go to a container, probably one you own in like your house or something, and put all but one in. Do the trick with the one left in your inventory and it should work. It is awesome for like, Black or normal Soul Gems and ESPECIALLY Azura's Star. Great way to get money.
(P.S. This was fixed by a patch, so 360 owners who got the patch are screwed.)