Something simple like the teacher test is a good start as it is a static position.
Like i said in the other thread here
basically demo's that don't require momentum, big movements, rotations (of the body or arms) or explosive power in order to pull it off. Not to say that those can't be used, but they aren't the primary means by which most internal people are generating power.
Anyone who has Jin, should be able to do Forrest Chang's stupid jin tricks. As Forrest said in his seminar, any big name guy should be able to do it, and might laugh because they are very basic things, that get built upon. I think there are 7 in total, and if you haven't been exposed to the subject matter before, they can be quite surprising, and the martial utility becomes apparent right away.