/ This is a missable trophy, so you have been warned. If you're wanting this, make sure you go through with it before doing anything else. /
In the first room on the second floor is a sleeping convention attendant. He is beyond waking up, but there's thankfully a television here to occupy your time. Actually, you need to view the television to find out how you can get the diamond to power up the Chrono-Johns here in the present, but in order to get this trophy, you have to turn it off. While I say it is missable, you have plenty of time to go back and turn it off, but there's nothing in the story that actually requires you to turn it off in any way.