Bill Zebub
“It’s probably Matt Mercer’s fault.”
Scenario: the PCs have just opened a door.
Players: We look beyond the door.
DM: This dark 20x20 foot room seems to be empty other than dust and a few cobwebs. There do not appear to be any exits other than the door you have just opened and are looking through.
I cast fireball into the room. All that "seems" and "appears" crap tells me it's neither as it seems nor as it appears.
(Kudos to @Charlaquin for a doing the re-write.)