Did you notice that sometimes when somebody shows how to play an excercise he just can't stop at the end of it and adds something like long vibrato, a couple of extra notes or even several bars of noodling? I've seen that plenty of times in instructional videos on YouTube and yesterday found my bass teacher occasionally doing the same. He is a great player and explains everything pretty well - that impression I got from our first lesson. But this little thing makes me wonder if there is a reason to worry.
. It DID make me think 'I want to be able to do that' (though I still don't.)