Sign #1: Your annoying talking pumpkin-head key chain shows up in their junk drawer.
Sign #2: Their mom knows your birthday.
Sign #3: They never get so busy that they can't give you the "Awesome!" Or the "Shut up!"
Sign #4: You look good in the badly focused photo in the too-dark room.
Sign #5: They feel the need to tell you how to put on a seatbelt.
Sign #6: You never complain about the freezing house (out loud) because you too want to save on the heating bill.