Jollywanger

A Confidence trick - To do something easy to get your confidence up before you face the real hurdle.

Pool - If there's a ball by the pocket, and a harder shot - don't necessarily go for the harder shot in case the other balls is accidentally pocketed by the other player. Sometimes it helps to pot these, then go for the others, feeling a little more confident. This is a Jollywanger.

Brain-weight

When there's something you learned a long time ago, but can't remember how to do it because you haven't done it for so long. It's like a muscle you haven't been exercising or flexing so you must have put on Brain Weight.

I can't believe I forgot how to to do long division - I must be putting on brain-weight!