Steven Spielberg was making a high budget documentary feature in 1980s about creation of the world. Special FX ate a lot of the budget, everything was made traditional way, so all those miniature mountains rising and volcanos erupting etc. was one shot show only. To get enough material, three separate camera units were used.

After the magic word "action" the set was alive with tidal waves, ground shaking and volcanos going boom. Spielberg watched this, amazed and smiling, through his trademark glasses. After the action stopped he calls the first cameraman:

-So how did you like it, guys? Amazing stuff, isn't it?
-That would be understatement, Mr. Spielberg! This was a masterpiece! Definitely an Oscar material! But there's one slight problem, sir...
-...what now?
-...well... err... because of all this excitement we forgot to remove the lens cap from the camera and... hello? Sir, are you there?

OK, so Steven is really mad now. He calls the second cameraman:

-OK guys, did you get that scene?
-Yes, Mr. Spielberg...
-...you did remember to remove the lens cap?
-Certainly we did! That's the first thing to do, after all...

OK, everything seems to look better now, thinks Steven

- ...but the problem is that we put the wrong reel on the camera and we only got the first 90 seconds or so... sir?

The really frustrated Spielberg hangs up and calls the third camera unit. This time he is really scared:

- Guys, we had some problems with the other two camera units, how about you, anything wrong?
- Negative, sir! Everything is going smoothly!
- You did remember to remove the lens cap? And to install the reel?
- Sure thing!

Phew! What a relief - thinks Spielberg

- As we said, sir - everything in order! So, when do we start?