I had the honor of being short 2000 BSC over the long weekend with only 14000 in the account. Like many other stocks BSC is not marginable. I know that I would be bought in at the open, at least partially, so I placed a market order to cover all 2000 prior to the open. Later that morning, after being away from the market, I find out that even though I closed the position on my own, IB bought me in for 1000 shares, so now I was long 1000. Not so bad since I was up 1.70 on the 1000 and had been up even more, but didn't know it at the time. Good thing the open was the low instead of the high. WTG IB!!
Much better than a stick in the eye.