For one thing, you could count the peace signs for points. Points could also be added for the t shirt worn, maybe with a John Lennon shirt worth one point and Che Guevera shirt worth ten.
I’m not sure if pot should count for or against the score. That probably depends on how much he had on him, and how much he had smoked.
You beat me to it. And you’re right — Make the Che t-shirt a point multiplier.