Two questions I've asked before, but alas I forget the answers and I can't find my old posts :)
1. What does "knock me down for a six" mean? Did we ever deduce this? lol
2. Is it just me or is Roger singing part of Invisible Man other than the "Freddie Mercury!" at the beginning?
Being English, we use "knock me down for a six" sometimes locally. I think it originates from cricket where you would knock the ball for 6 runs and means in this context that you have scored highly.
It can also mean that because it has been knocked for 6 points the ball must have been hit very hard. "Knock him for six" has been used to describe it when somebody has been punched or kicked very hard.