A childhood belief about imaginary friends

I had two imaginary friends, one called Giant and one called Spider (who may or may not have gone on to be a environmental protester in Coronation Street, we lost touch). Giant and Spider used to travel everywhere with us and I would make sure my family left room for them in the car. Many a time I would shout at unsuspecting aunts and uncles when they sat in what they mistakenly thought was an empty seat only to be told that they were squashing my friends.