As someone who has devoted the last several years of his life to playing that extra round of golf, I can state quite definitely that the professor was totally wrong when he said there would always be time to clean your house and mow your lawn.
Another Doper: “Cite?”
What about the mayonnaise?
What does that represent? After all, you can’t even perform the demonstration until the mayonnaise is all gone. If the jar still had mayonnaise in it, would it still be full? What about mayonnaise and golf balls?
Then a smart-ass student goes up and screws the cap back on the jar, puts it his freezer overnight and shows the class the next day that it ruptured when the beer froze.
“There’s one more lesson to be learned here, folks: leave some slack time in your life. If you occupy yourself completely 100%, you won’t be able to deal with external stress!”
Kinda hard to get to all those golfballs with all that sand and gravel in the way. Hence the true reason for the beer.
You’ve got the cause and effect backwards. The more the beer, the more the sand and gravel you find around your golf balls.
"Fool me seven times, shame on you. Fool me eight or more times…‘’ -Amy Wong
Alan Bennett satirised this kind of platitudinous thinking and tortured analogy in his parody of a C of E sermon in Beyond The Fringe in 1960.
http://www.sof.org.nz/esausermon.htm
It’s not very long.
Isn’t “air” important to your life?
Yeah, I was a Philosophy major and I can’t imagine any of my professors doing something like this unless it was supposed to be some sort of joke about what the study of Philosophy wasn’t.
The jar itself, the glass it’s composed of, is mostly empty space, and no amount of “filler” will make it “full.” This should have been in a physics class, not philosophy.
And what’s all that shit on the wall behind him?
Judging from what’s on the blackboard, it was.
I would have asked, why not simply buy another jar of mayo to make a variety of sandwiches to enjoy by yourself or with others? Then, use the jar for nail, screws (maybe build something for someone) or something (some people use them for drinks). Far better uses and a more clear way, at least for me, to understand the glurge here.
Yeah, is that a real chalkboard? 
Doper: My post is my cite.
Pretty sure non-duality is the end of philosophy. So, there is no difference between the golf balls and the pebbles, sand, beer and so on, or you either for that matter. You are them, or more precisely, there are no golf balls and so on, there is only the Self.
A better ending would’ve been for the fake professor to pick up the jar, stare at it, in dramatic pause, then smash the whole mess against the floor — golfballs, rocks and sand-beer going everywhere.
"AND THEN YOU DIE!"
Gay guy (me): woah those dudes on the right are hot! Wait, what’s all this about mayonnaise and beer? Too many calories!
All of those improve the story far beyond the original.
…and the very next week half the congregation was thinking about taking care of their golf balls first.
Boon: I gotta work on my game.
Otter: No, no, no, don’t think of it as work. The whole point is just to enjoy yourself.