I find it more polite when I yawn without opening my mouth. I also talk this way too, with my mouth closed.

“Everything east of the Mississippi is west of the Mississippi, if you just keep…”

“I put the “cat” in category. And not only do I put it there, but I pet it too.”

“I have a pet frog. He sleeps in a king-sized bed, just in case he happens to be…”

“I would rather build a relationship than a wall. Can you pass me another brick?”