He already went somewhat ballistic a month or two ago when he said he was so mad he couldn't see straight. Assuming the Patriots' current offer was less than Mankins reasonably was led to believe (by whomever) that he was worth, or structured so that he was going to get less in bonuses, I wonder if that had anything to do with it.
Either way, he has effed himself (two times now) by going public like this. If they do in fact end up trading him to a team willing to commit high draft picks as well as more money than is being offered [given that there's total uncertainty about a lockout in 2011] then I'll stand corrected.