Presently I had the misfortune to hit my elbow against the mattress.
A knock at the door.
"Who is there?" I cry.
"Can I get you any thing, sir? I hope you are not ill," says a voice which I recognize as that of my landlady.
"No, why?"
"I thought you knocked, sir."
"No. Oh! I knocked my elbow against the mattress."
"Ah! that's it. I beg your pardon."
I shall be well attended here, at all events.