He likes to press them, both literally (I can often get him to go somewhere just by the promise of pushing an elevator button) and figuratively.
Of the latter, his latest technique is screaming "Ellllmoooooo!!" at me with attitude whenever I say anything that constitutes the concept of 'no'. Elmo is his choice word because he knows I don't like him to watch more than an hour every couple of days; so if he yells "Ellllmooooooo!!" at me he knows it pushes my buttons.
He's 20 months old. And just like his mommy.