"This house will do." He thought.

Barty Crouch Jr, insane Death Eater, just escaped from Azkaban and was looking for a place to hide from the Ministry of Magic, which was following him, he decided to hide in your house, so he wouldn't be found.

Just as he was searching the living room, you entered your house, which made Barty smile broadly.

"Hi." He spoke in an insane manner. "I hope I'm not intruding."