very old story but it seems to fit...

new truck driver took a 17 foot tall truck part way thru a 16'6"
tunnel.

driver finally gets back to the shop, tosses the keys on the desk and
starts back out the door to clear his locker.

get yer ass back in here and take those keys, says the boss, you're
driving tomorrow.

later, someone suggests the boss is a nice guy, no, says the boss (who
is obviously also a pilot) at least i've got one driver now who will
never-ever get in a truck without measuring it.

it's the difference between a bad screw-up and a very valuable lesson.


dan