So I entered a limit order for a credit call spread and a credit put spread on the OEX weeklys that expired today- I sold the 500 call and bought the 505 call for a .40 credit. 108 contracts. Once I got into this position, I left my computer... cam back and I then entered a limit order to sell the 500 put/ and buy the 495 put for a $2 credit. 30 contracts. (due to an emergency that came up,I got busy and totally forgot about my positions and order ..anyways. just got back to see that it closed exactly at 500!!!!! all my positions expire worthless for a +$10,000 gain !!