Murder Riddles

Hotel in Japan

Marcel Boast was a very successful business man, and his job allowed him to travel all over the world. He had just arrived in Japan, and the meeting he was supposed to go to was only going to start n three hours time. He decided to quickly check in to his hotel, and have a quick nap, only for half an hour long or so and then he would get ready for the meeting. 

So he did as planned, checked in, and then followed the bellhop to his room, which was on the seventh floor out of ten. He collapsed in his four poster bed, and fell asleep almost immediately. But, sadly he was awoken by a knock at the door. He glanced up to see a man, with a surprised expression on his face standing in the doorframe. 

"Oh, I am ever so sorry. I thought this was my room, pardon the intrusion." The stranger said, quietly closing the door. 

Marcel shrugged, and went to lock the door he had forgot to lock before he had gone to sleep. He then lay down again, trying to go to sleep again. Suddenly he shot up in his bed, and called the lobby that there was a burglar in the hotel. 

What makes him think this? Comment and Vote!