It's the "k" sound in each of the items - in the movie The Sunshine Boys, the old comedian explains that the K sound is just naturally funny. Maybe that did it, the 3rd item also being a k sound. Sigh! Good thing I have perfected the
silent "Augie Doggie / Doggie Daddy" laugh "heh heh heh heh" or else I would wake up the whole apartment building when you guys do this to me