J.M.
I want to second the respondant who suggested that he clean up his own mess, it teaches him responsibility for his own actions. On the positive side though, the break through with my son's potty training came when Daddy took him to the potty and taught him to stand to pee the way big boys do. Having him stand to pee(not sit like Mommy does)made him feel grown-up. When we got mastered that skill, then we worked on sitting down for the 'big' job.