After telling this funny tale to Jimmy Fallon ... Watch it for yourself in the video below: Seeing Carl Weathers and Sylvester Stallone spar while having an enjoyable time is sure to be ...

But before that, he was Carl Weathers, undrafted linebacker. His NFL career lasted only two years. And, to this day, he remembers the words spoken to him by a legendary coach that ended it.

Funny as hell. Loved his sons more than anything ... gave a big tribute too. He said: "Carl Weathers will always be a legend. An extraordinary athlete, a fantastic actor, and a great person.