Find anyone, give them an utterly blank sheet of paper and maybe a pencil or pen. Ask them something along the lines of "what can you do with this"? There is an infinite number of responces, but the nerds will always, always ask for the "rules" of what they can do.

Which is why I bugged the living shit out of this poor therapist when he asked me to do exactly that. After spending nine out of my allotted ten minutes asking him what exactly the activity entailed, I quickly sketched some sand dunes and a camel and made up some crap about how I related to it because of my childhood, which I was sure meant something deep in his book. (I grew up in a desert-y area.)