Same thing happened yesterday when I think about a block of 14 million when at 18 for the last trade. By my calculations, someone was willing to bet about 23-25K for each trade on this baby!!
There was a 15,536,175 "T" Trade 6 minutes after closing. Someone a lot smarter than me can speak to what a T trade is (MGF are you in the house?), but what I think is they are a trade between MMs. I don't think in the scheme of things that they mean much.