This is the first time the Champion has ever been knocked down.
4 seconds sound clip from the Rocky (1976) movie soundboard.
You can hear this line at 01:48:22.239 in the Blu-ray version of the movie.
Quote context
[...]
- He's just trying to make this man make the first move... see! Make him miss like that.
- The Champ is just taunting him now. He's dancing around.
- I don't believe it! The Champ is down.
- Creed is down! What a surprise this is!
- This is the first time the Champion has ever been knocked down.
- The referee is giving him the count. Six... seven... eight.
- Appears to be all right. A little glassy-eyed, but okay.
- Come on, Rock! Go to the ribs! Go to work, Rock! Let's go to work right now, Rock! Come on!
- Now Rocky coming back out, and he's like a bull in a china closet. He really wants it.
[...]