My roommate is not a ghost:

"I'm so happy you have a place of your own!" Feliciano said on the other end of the receiver. Ludwig was in the process of creating a new chore list.

"I don't live alone you know, I have a roommate. Technically, it's not that different from living with Gilbert." He explained and added the final touches on kitchen cleaning rotations. "Actually," he paused to review his work, "Gilbert was around more."

"You mean you haven't seen your roommate?"

"I have at our initial meeting. But since then, the only thing reminding me that I don't live alone is an occasional glass left on the counter in the kitchen, or sofa pillows and cushions on the floor. The other day my painkillers, which are usually in the medicine cabinet, were on the bathroom sink. And today, my chore list was missing." Feliciano gasped and paused for a moment before wailing.

"Your roommate is a ghost!" Ludwig removed the receiver from his ear for the safety of his hearing.