What are good sources of "training stories"?

Any recommendations for collections of stories that could be told
during trainings? In my mind, a training story should have a few
qualities: 1) Short, typically a page or less, 2) Should get the
listeners to think, that is, it has a point but isn't obvious about
it, 3) Should have a universality, interesting to many different types
of people.

For example, a story I've picked up and used is the story of the steam
engineer who was called in to repair a steamship boiler that was
leaky, noisey and inefficient. The engineer spent a few hours asking
questions, examining pipes, listening to the noises, and feeling
around the structure. After this, he walked over to a red valve,
pulled out a small hammer from his shirt pocket and tapped the valve
once. Immediately, the noises disappeared, the leaks stopped and it
seemed to be functioning much more efficiently. Everyone was happy,
they congratulated the engineer and he left. A week later the boat
captain received a $1000 bill from the engineer. Not comfortable with
paying that much for sucha fast job he asked the engineer for an
itemized invoice, which he received another week later. It said: For
hitting valve with hammer $1, for knowing where to hit $999.

no but here is a related story that I enjoy:

The Captain and the Chief Engineer of a ship were having an argument
about who had the harder job. This debate went on for a few months
until one day they were both sitting in the galley revisiting the
argument.
The Chief said: "Your job is way easier, all you do is pick a point on
the chart and set your compass to it"
"No Way" said the captain. "Your job is way easier those engines are
just a larger version of my diesel Chevrolet at home!"

So each men decided to switch jobs for awhile to settle the argument?.
about an hour latter beads of sweat are running down the Captains brow
as he struggles keep the engines running.

Finally the captain hears a large bang and the lights go out.
Discouraged he heads back to the galley to admit defeat. "I am soooo
sorry chief, I lost the plant. Your job is much harder than I ever
thought".   "That's OK...." replies the Chief Engineer "we ran
aground!"