That is a good description, I can never think of the word to describe the inner conflict between what you are willing the creature to do, or at one level anticipating what he is supposed to be doing, versus his own unnatural time table that you are watching, the incongruity of it, or conflict of it, eventually puts me into belly laughs.
I have spent 20 or more minutes watching them, until it just gets too exhausting.
Like sitting on the edge of your chair, and it eventually takes a toll on your patience.