Urge Marty not to race
From Create Your Own Story
Marty appears to ignore you as he revs his engine. But then he puts the car in reverse.
Realising he avoided the accident in had in the alternate future, you pull the fax paper from the future with the message "YOU'RE FIRED!!!"
The words disappear from the paper. The Doc arrives in a train time machine. He tells you to make your future a good one.
The End.