43 years ago I passed my driving test. The examiner gave me a "pink slip" to say so, and off I went, straight round to all my my mates houses to take them for a spin, perfectly legally.
17 years ago I passed my MEP rating and the examiner gave me the stuff to send off to the CAA. I got straight back in the twin and went for a spin (solo) but it did not remotely occur to me that It might not have been legal to do so, even alone never mind with passengers.