CHFS doubled the day before. News was about them being cleared to do a study. I didn't think that sounded like a big deal, but the $volume of the premarket was about 2/3 the mkt cap of the company itself. Entered at the open, but considered a lower-priced pre-market entrance because the pre-market volume was so crazy that I expected immediate spiking. Still decided to wait and see the open, then jumped in as that spike began. Exited because it hit a lower high.