I have a student who tends to be a bit defiant. I have dealt with MUCH worse, but this child is my challenging student this year. He can behave in short bursts (about 20 mins, not bad) but for the most part he is making noises, talking, refusing to do his work or playing in his desk. I have him on a behavior contract. The behavior I want to better control is laughing or snickering. It's nearly constant. Everything is funny to him, from a classmate's wrong answer, a child who trips, a dropped pencil, a sneeze, etc. it's especially bad when he makes a poor choice. When a teacher tries to redirect or remind him of a rule he cracks up and sometimes rolls his eyes. I'm not sure how to handle this and it's very frustrating, not to mention disrespectful. I've already had a parent conference (impromptu; I called home at the very end of the day and Mom left the carpool lane to come talk to me after a particularly bad day of defiance) but Mom sees the same behaviors at home and can't manage him either. Admin is also involved. Tips?