None really, unless you count special effects. Here is one from the end of Chapter II of Sinclair Lewis's "Babbitt."
"Had kind of a run-in with Graff in the office. He's getting too darn fresh. I'll stand for a good deal, but once in a while I got to assert my authority, and I jumped him. 'Stan,' I said--Well, I told him just exactly where he got off.
“Funny kind of a day. Makes you feel restless.
“Wellllllllll, uh--” That sleepiest sound in the world, the terminal yawn. Mrs. Babbitt yawned with it, and looked grateful as he droned, “How about going to bed, eh? Don't suppose Rone and Ted will be in till all hours. Yep, funny kind of a day; not terribly warm but yet--Gosh, I'd like--Some day I'm going to take a long motor trip.”
“Yes, we'd enjoy that,” she yawned.