I remember getting very relaxed (The stranger sat next to us had a nice single malt which he insisted on sharing) watching the "Illegal Eagles" at a Warner show and then being unable to find our MoHo.
After 20 minutes wandering, SWMBO had a brain wave,
"Ours is a white one" she announced "and we are parked next to another white one"
Ir worked within a minute we found our van !