CAT traded near it's high of 73.31 into the close and went out around 73.23. I was going to enter an afterhours order to sell at 73.35 and I almost put the order in as 72.35 instead of 73.35. I looked at the indicated bid, and it was 72.30 so I had to go back to charts to make sure the big figure was indeed 73, not 72. I thought, "gee, that was a close one" and I was a bit annoyed that the indicated bid was 72 something. So I look at the matrix screen and I see it shows the last trade as 500 at 72.61 !! Did somebody just do exactly what I almost did? Did they put in what they thought was an above the market order one point too low? Pretty effed up.