I think it would be funny to put "No Loitering" signs on busses.

Cones, like ice cream cones or orange Dept. of Transportation contruction cones, or any cones...I kind of want to stack a whole lot of them. It's so satisfying - an endless pattern that reaches to the heavens.

You know how if you stare at a silver metal fence for a long time you get that metallic, bitter sensation and taste in your eyes and mouth, and sometimes you have to do a quick blink of the eye and twitter of the head and neck, similar to the movements following eating a really sour candy, and how it zaps a 3-second headache into your brain along with visions of black euphoria?

There's that. There's also how we say "you know..." and assume others do. Explaining, and sharing, and finding the common force before the fact, is starting to prove beneficial in making for a better conversation.