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

“Question for your life: If love existed an octave above where your vocal range …”

“I put the choir in kissing. Too bad there’s no sing in fornicating. But that do…”

“I’ll jump off a bluff, or a cliff, so don’t call my bluff, or call me Cliff.”

“She had breasts like deflated balloons, and nipples like the wrinkled and flopp…”