It doesn't take a mathematician to add a simple sum....

colleague 1: "I'm having a shocking day today.  I might just punch someone in my next meeting if it's anything like the last one."

colleague 2: "Now, now.  Violence is never the answer to anything"

me: "So how would you have resolved the situation in Germany in the late 1930s?"

colleague 2: "What situation?"

me: "....."

colleague 2: "What situation?  What are you talking about?"

me:  "Before I say anything else, I want you to think about what you've just said."

colleague 2: "..........................[someone else mentions WWII] Oh, Hitler!"

me: "We tried appeasement and it simply didn't work"

colleague 2: "peas what?"

me: "A.  Peas.  Ment"

colleague 2: "Don't patronise me!"

me: "I'm trying really, really hard not to..."

colleague 2: "I did an A-level in history you know.  I've got a degree!"

me: "........."

Of course, under the terms of Godwin's law, I forfeited the argument anyway, so..... Reductio ad Hitlerum. QED.  I wasn't really about to try to explain that though.