This story comes from the 2-part ABC documentry about Don Bradman that was screened recently.
It was a game late in Don's career and he had just come into bat shortly before lunch. He was straight into form square driving 3 consecutive deliveries to the boundary.
The opposition keeper was playing his first first-class match and thought he'd take the p*ss out of Don, so he walked up to the great man and said "I guess thats the only shot you know how to play?" (obviously, the guy was a complete idiot).
Don just smiled and replied, "I'll show you a few more this afternoon if you'd like."
The next delivery was very quick and Don square drove, and it flew like a rocket to the boundary.
Don turned to the keeper and said, "Sorry, but I did say this afternoon."