It's bad to quit last minute and leave people hanging.
George promised to help pull Fred's truck out of the ditch today, but then he won baseball tickets.
George wants to go to the baseball game.
"George tells Fred, ""How about we pull your truck out a few hours sooner, and we both go to the game?""."
George goes to the baseball game instead, leaving Fred literally ditched.
Fred and George pull the truck out together, and then they both go to the baseball game.
Fred is furious at George for abandoning him like that.