On prior trips to Europe, I had seen an engineering innovation in which toilets had two flush buttons, one for “liquid waste” and one for “solid waste”. I’ve started to see these toilets in the US now too. It seems like a perfectly reasonable way to conserve water. But here in the Arcotel in Vienna, the clean, modern engineering has a humorous element. It took me a little while to figure out, but once I did, I can only chuckle at the engineer who had fun coming up with this flush button.