Have you tried doing it in the toilet and forgetting about the potty? Maybe he associates the potty with being a baby and wants the toilet instead. That's how my son did it. Also, I know a friend of mine would leave her son in diapers only - not pull-ups and would cut a hole in the diaper so they could poop wearing it while on the toilet. It was one step in the right direction and eventually got her son to do it in the toilet properly. I am not a fan of bribing, but some people give Hot Wheels for each successful bowel movement. Go for it if you can afford it. I hear it works wonders with the right personality. My son has no 'currency', not even treats so we don't use bribes at all. Do whatever works. Get creative if you have to. I would also be careful you don't get angry or mad at your son for his behaviour, as difficult as it may be. Kids are trying to control what they can and their bowel movements are one of many they hold on to as long as they can. Just encourage him, try not to humiliate and hurt his self-esteem. Try to get a friend who is going regularly to come over and encourage him. Maybe a teacher or mother of a friend can help. Sometimes we push too hard and they just need to hear it from someone else who is less frustrated than we are. We used to dance afterwards, literally. Get a camera, take a picture of everyone having fun and send it to Grandma, a real treat that only happens when he does it. Best of luck!