Martin Johnson.

Best example of why was in 2003 England vs New Zealand in Welliongton i think it was, and England were down to 13 men, only 6 in the pack and took a NZ scrum against the head on the England line.

After the game Johnson was asked what he said to his players to make them win that scrum, he said 'what? do you think i had some chuchilian speach? i told them to bend over and push!'

Also when asked what was going through his mind during that scrum he replied 'My spine!'

What a legend!