the easiest (and sometimes hardest) way to correct this behavior, is not react at all and walk away. go do something else where you can see him, but act like you are not at all interested in what he is doing, because what you're doing is way more interesting than his temper tantrum. once he sees you're not reacting to his tantrum, AND that you've moved on to something else, he'll quit doing it. my now two year old started throwing these kinds of tantrums at around 9 months old. i was sooooo worried she was going to get hurt i would grab her and talk to her soothingly and try so hard to calm her down.... this only got her going more and she'd scream more and longer. it wasn't until she was around a year old or more that i realized i needed to completely ignore her screaming. she didn't quit the tantrums immediately, but they got shorter and shorter and now she almost never has a tantrum ever.