LOL. When I left a job to move where I am now, I trained my replacement.
I can't tell you how many times I caught him with his foot on the air pedal. I mean, how hard is it?? I can hear the air coming out from under the table.
So I made him get in the habit of grabbing the fixture and making him give it a good shove to make sure it was down on the table.
A couple of pinched and smashed fingers later he quit doing it.
Sadly, he made it about 4 months and then he was shown the door. Just couldn't get the concepts like what valve job to use with which head and why, even though I wrote it all down for him.