Sales guys in my company are unbelievable. They told client that my analysis algorithm runs for about one hour, so that is the time they have to wait for results. I asked if he actually asked what hardware do they have, and if they want all analysis done (its a complex algo) paralell, or just one by one.
Ofcoursenot.
Then I suggested to better ask these things, otherwise we end up reckt. Annnnd he said they will question our professionalism if we ask too much questions.
Ok so let me summarize. My algo needs to run maximum 1 hour long, regardless the actual functionality and input data, on any fcking hw you can imagine, or else i am not a pro. Mmmkay.

I have been asked to teach a few things for newbies at work, without coding background.
I used the metaphore of pizza, empty pizzabox and no box for teaching NULL. I have read it here on Devrant, written by someone awesome of the community here.
My boss overheard me explaining it, and said that that was the most beautifull expanation of NULL he ever heard.
.......I was like: yaaay Devrant FTW!

Also newbies understood it instantly so kudos to you sir, original poster!