I accidentally sold 12k shares a few days ago. I put in a sell order for the shares in two of my accounts (small portions of my 250k shares) but then decided against it. I thought I'd removed both sell orders, but I guess I only removed one. I was surprised to get an email confirming my sell a couple days later. Oh well. Now I only have 240k shares.
Maybe it's just idiots like me who can't keep track of their sell orders. LOL. I was so sure the price would go up after I sold some...