Utd have been threatening to do that to someone all season but have usually stepped down a level at 2 or 3 goals ahead, the only reason they continued to hammer Roma is because of the bad blood that his built up. Fergie could have sent them out after half time to shut the game down but he sent them out to dish out punishment to the Roma fans and authorities, Roma's players were almost unfortunate bystanders
The game was also a perfect setting for Utd to play to their strengths, all out attack is the way Utd like to play but both Milan and Bayern are canny enough to know how to exploit that, in fact Lille almost managed it!
Oh and Hitmann if you're around, 2-1 against 10 men is not an ass-whooping, THAT is an ass whooping
I still think Chelsea will win this year though, in fact the way they won yesterday will probably have done as much for their belief as Utd got from the Roma massacre, to go to a tough organised side and go behind only to come back and then win in the last minute takes a lot of character..