You never know. That hitchhiker beckoning to you from the side of the road might just be a famous celebrity.
I just finished reading Goddess by Anthony Summers. In it, he relates a story of Marilyn waiting by the side of a road, trying to hitch a ride from an unsuspecting passerby (there had been a mishap with her scheduling that day). But car after car drove by, not realizing they were passing up the opportunity to meet the immortal Marilyn Monroe.