You and Brad are best friends, and roommates, but Brad is blind, unbeknownst to him, you're a mythical creature, (of ur choice) and since he's blind, he's unaware of that, whenever he hears a sound, he shrugs it off, till one day

Brad: He's laying on the couch just listening to music with his blind eyes closed, when he hears the front door open and close, then your footsteps Hey roomie