"Invisible? Invisible?!" Unicorn hops up on the chair, crouching in a careful balance so as not to fall off, face barely an inch from the door as they speak through it.
"I thought you knew! Out of sight, out of mind! Out of sight, out of mind! OUT OF SIGHT, OUT OF MIND!!!!!!!!"
Of course, the excitement only causes them to slip and fall noisily, the chair falling away from the door, which they rapidly prop back up before stalking off, muttering darkly to themselves.