DS has really taken to screaming - alot and I just don't know what to do. He will ask for a drink and if I don't get it right away (or even if I do!) he will scream and scream, change his mind about the drink about 10 times and throw it in the sink. He isn't even thirsty 1/2 the time - he either tips it into the sink, onto the floor/toys etc. or drink it and spit it into lorries etc. That's just one example. I take the drink off him and he screams - should I be distracting him, just walking away and ignoring the "driiiiiiiiiink! driiiiiiiiiiiiiiiiiiiink!" or be doing naughty step/mat/telling off somehow. Sometimes he just randomly screams aswell. What do I do?