"Do you ever get tired of sarcasm?" the doctor asked offhandedly.
"Yes," the patient replied, with all the earnestness he could muster. "It's absolutely exhausting."
The doctor looked up at the ceiling as though speaking to an unseen being. "That's enough," he said at length. "You can stop making meta-jokes now."
The author, writing their story, cringed. He was powerless against his own characters, so he re-wrote the scene.