Foyer (Luigi's Mansion)
Luigi never encounters any ghosts in the Foyer, even during the blackout (except for the Gold Ghost that drops the key to the Parlor at the start of the game). All the mirrors (except for the one in the Mirror Room) link to the Foyer, including its own mirror.
The Foyer is the only room (excluding hallways) to have two floors. At first, the door on the first floor is blocked by a force field and requires a special pink key to disappear (which is obtained by defeating Chauncey).
Just above the entrance's rug is a big chandelier. If Luigi steps underneath it, it spins and falls to the floor. (Luigi gets injured if he is hit by it.) He can then hear Chauncey's laugh, implying that he caused the chandelier to fall to the ground. After Luigi completes Area 1, more specifically, after defeating Chauncey, the chandelier no longer collapses to the floor, trying to hit Luigi.
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