Oh this brings back memories! I did lessons on a QH pony in our barn - he is the best trained lesson horse ever - totally knows his job. But that does not mean he doesn't have a sense of humor. He has 3 trots - the correct one for lessons that you can actually post with; the jack rabbit hah hah gotcha trot (taking your leg off makes it worse). This one takes slowing your post and touches on your reins, plus talking to him to slow down. Although he is a true pony in size, he also possesses a full horse size 12 foot canter stride.
The third trot I never rode until I showed him. We did our x rail classes and went in for the flat. The pony pulled out this wonderful floating pacy trot that was amazing to ride - once I figured out what was going on. Nothing like being judged and wanting to look down at your mount to make sure there hasn't been a switch!
Love that pony!