i think its a age thing, like how they say "terrible twos" only my boys seemed to skip that, and ds1 got this foul mood arround the time he turned 4, he would yell and scream at you, punch and kick the walls, throw and try to smash toys... gets the s**ts if i tell him off or say no. hes just turned 5, and were developing ways for him to "controll" his temper, some days it dont work, but he is starting to learn how not to react, but now my 3yr old is picking up the bad attitude (and he is worse than the older one was!) hope you find ways to calm your littlies down!