The funniest trainer moment for me was as a young teenager, working in the warm up pen before a class with my reining coach. He was drilling me on the pattern. Imagine big, tough looking cowboy that talks real low & slow like Sam Elliott. He puts his hands on his hips and in a girlie falsetto voice, does this ballet hop thing and says "Small slow, Big fast, swiiiiitch" When he got to the switch part he was doing ballet leaps to the other foot. Never forgot that pattern! Still tease him about it 15+ years later when I see him!
Some things I catch myself saying a lot...
Your horse has to follow his nose, keep him between the reins & point him there.
I charge double for running over your instructor.
Can't turn your car without gas can you? Now use that outside leg!
It takes a hundred times to get something down, 99 more to go!
Use that magic word! WHOA!
Life is like a camera. Focus on what's important, Capture the good times, Develop from the negatives and if things don't work out, Take another shot.