I swear on a stack of bibles this is true.
I worked with a guy named Harry Ennis. He pronounced his last name "N" - "isss", that is, rhyming with tennis. Problem is that his middle initial was P and he always used it. My God it took every ounce of willpower I had to not guffaw out loud every time I saw the guy's name on the daily memos listed as "Harry P. Ennis." I suppose I was just being juvenile, but I worked with this dude for 5 years and I swear I never attempted to say his last name, because I knew my subconscious brain would take over and pronounce it "EE-nous" and then I would eventually faint from my own uncontrollable laughter.