Im quite relaxed with disipline as i believe he is just not old enough to understand and also think that constant no's are counter productive. so i dont disipline that often. However when the line gets crossed, hitting or pushing someone else child or bouncing on our very patient but eldery (and rather large) dog. I have to make sure he knows its wrong I dont shout (although I have tried but this makes the laughing worse!) I take him aside come down to him (like your supposed to) and tell him firmly that NO, its unexceptable to hurt others. HE LAUGHS IN MY FACE. every single time proper little giggles like its the funniest thing in the world!. if i put him in his room he still laughs and then just plays in his room. I have even tried just leaving the room (No audience). we get no laughs at that he just carrys on! any advice it is very hard to disipline a hysterical toddler!