Whenever I go into canter, he does a high pitched squeal that cracks me up :) and if I have a carrot or polos in my pocket he sticks his nose in my jacket and investigates.. he's a cheeky chappy :)
I always carry a whip, my cob is quite stubborn and naps a lot so I find it helpful to carry one with me even if I don't end up using. He know's if you don't have a whip with you though and he will play up like a bugger! :P