Like someone's girlfriend riding in the back of a PA28 instructional flight for a jolly.
Indeed. Like way back in '82 when I was doing my PPL Navs, the Instructor permitted my (then) Girlfriend (a 'nice little Greek Girl'
) to hitch a ride back to Adelaide.
The Instructor did say at the time that it was not exactly 'kosher' in doing so, but we'd get away with it if I didn't prang the A/C!