Tell a potassium joke?

I spent a week at the University of Dayton helping run a material science camp. We got to hang out in Science Center's Wohlleben Hall and saw the following cool things.

First, there was Chudd Auditorium which has maybe the coolest lecture hall periodic table I've ever seen and which I got to control since there was nobody in there all week long...

Then we got lucky enough that somebody in the chemistry department posted these chemistry jokes in one of their display cases...

I saved the best for last. Schroedinger's Cat walks into a bar...and doesn't.

That's hilarious.