If your 9 year old son mysteriously “disappears” into his bedroom more than an hour or so after he’s already dressed and brushed his teeth, you would be very wise to knock on the door and wait a few seconds before you go barging in. Maybe announce yourself first. Maybe not walk right in, look straight at him and say, “Hey buddy, whatcha do….oooh.” Otherwise, the rest of your morning could end up just awkward.