Ask to borrow his comb then comb your tongue.
Take random objects in his office and glue them to the floor.
Refuse to co-operate unless he trades his trousers.
Bring pots and pans. Bang them together when he asks a question you don't like.
After everything he says, say, 'And how does that make you feel?'
Point at random things and say, 'Where did you get that?'
Complain that his chair looks more comfortable.
Repeat over and over, 'I'm not hanging out with a bad influence.
Sit underneath your chair.
Stand on your head.
Kill spiders on the wall with your fist. Eat what sticks to your hand and leave the rest sticking to the wall. Draw a circle around it to make sure everyone sees it.
Never stop smiling.
Scream every word.
Repeatedly tell him to look at the ceiling. When he finally does, repeatedly tell him to look at the chair. When he finally does, repeatedly tell him to look at the desk.
Put your shoes on the wrong feet.
Try to seduce him with chocolate donuts.
Try to talk him into sitting on the floor.
Eat his books.
Talk to his leg.
Don't face him when he talks to you.
Talk really slowly.
If he offers you coffee, ask him to spill it on your lap.
Make sure you make bottom-prints in his couch.
Tell him you think his secretary is really a man.
Offer him an imaginary biscuit.