You must be aware that the market rallied 20 points ($DJI) into the close yesterday. I was watching Priceline Inc. (PCLN) and the weekly options. I had no positions though. Priceline rallied from ~ 639$ to 644$ in 20 mins before close. I was watching the 640$ calls that expired yesterday. In 20 mins, the call options gained >700% from ~ 0.45 to close at 4.30$. Was the last minute surge on this big kahuna done to push the weekly options? I don't have material evidence to prove it. But, the volatility in the big names (GOOG, AAPL, CMG, PCLN etc) has increased a lot since the weekly options have been introduced. The OTM weekly options, expiring on friday, move 300 - 700 % in the space of 4 days beginning Tuesday afternoon or so. This is only for educational purposes only, I usually do not endorse options officially. This gives you an idea of another instrument in the stock market.
Below is the 1 minute chart covering the last 2 hours of the 640$ call options that expired yesterday at 4 PM ET.