he puts one shoe on wrong and shows it to me asking if it's 'on the right foot'. He's consistently "wrong" every time, so I know it's a purposeful choice.
Hmm... is it always his left shoe? Maybe he is just waiting to see how long it takes before you get his pun? Also, I've made the mistake sometimes about being really silly about providing him corrective feedback around that age, that he'd do things wrong to get the reaction.
And while I'm here, I'd like to celebrate the relization that it is less than once a week that I have to tell my seven year old his shoes are on the wrong feet!
