[Noseshine]

To give a story from a different field so that it's not all IT stories here:

When I served in the German army as a battle tank weapons systems front line mechanic I didn't know all the tricks of the tank crews from the start (obviously) - nor that they did have tricks that they used to get out of training exercises and to (our) fresh coffee.

One common trick was to turn all the dials for brightness and contrast for the passive heat-sensor (night vision) all the way down. Then they told their commanding officer they had to go to the "Inst" (German "Instandhaltung" = maintenance depmt., in our case right behind the battle field - with power generator and attached coffee maker) because their screen had gone out. Which was quite important

The first time I went to such a tank I fumbled around for a few minutes, not finding anything, before admitting defeat. I called in a more senior colleague of mine. He went in, turned up the dials and that was all, case closed.

It was sooo embarrassing (to me, I don't think the other people gave it much thought) - that's the reason I still remember it even though it's been 16 years or so by now.