-Throwing the trash
-Loading and unloading the dishwasher
Those are the usual things that if he won't be there when you do it, expect a major tantrum.
Now, to answer your question why. Because he is too young and even if he says that he wanted to help but he doesn't get the whole idea of helping yet, instead, he things it's fun and so most of the time, he's just playing. So, the work will take about 3 times more than what it is supposed to be.
I know it is so good that he's learning to help without even being taught to and I hope that he would stay that way even he's old enough to understand what he's really doing.
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