My manager is a "you don't know shit" kinda dude.
This one time while guiding us on how to operate on databases which existed and somehow, he deleted the whole database.

Ofcourse, to save his ass at once he claimed "This is why I was telling you all this, see!? The whole database got deleted"

And yes, we had a backup of that database. And yes we weren't able to control our laughter too.
You should have seen his face.