Last one, I promise.
I taught this kid bass recently.
First week he turned up, was really attentive, and learnt all the notes in the first 5 frets of the "E" string.
Second week, he managed to learn all the notes in the first 5 frets of the "A" string.
Third week, he didn't turn up, so I rang his house. His parents said he wasn't coming back as he'd got a gig..