Today I was standing in line for a changeroom. The man behind me says "there's one" and points to a vacant changeroom. I say "thanks, I didn't notice." He says "that's because you're ignorant."
???
I said "excuse me? Have you ever even tried to plumb the depths of continental philsophy before? Just looking at you I can tell the only thing you've ever plumbed is a backed-up drain brimming with sewage, probably your wifes."
The scene soon became quite ugly.