When I was 15 I took a job as an aide at a preschool/daycare center. On my first day there I was assigned to monitor the kindergarten boys trip to the bathroom. A set of rambunctious twins put my patience to the test when I saw that they were peeing at each other under the stalls. Realizing I had better deal with this 'right' the first time, I handed them each a big wad of paper towels when they came out of the stalls and told them sternly 'Clean it up boys!'. Never had a problem with any of them in the bathroom after that!