Locked in Mr. Milton's Office

SCARY. VERY, VERY VERY, VERY, VERY SCARY. The three of us are locked inside Mr. Milton's office with only a flashlight and Mr. Adams glow in the dark shoes. There's been noises that we can't say over the wire because repeating them may bring back whatever it was. I hope we got a picture of what the thing was. Mr. Crawford thinks it's a ghost, Mr. Adams thinks it came back on one of the rockets he was creating, and Mr. Peters thinks all of this is a figment of his imagination. Tell us what you think this is?