I jumped in the wrong car once,same color and make. The duet of screams from the girls reminded
me of an USAF trim pad where they run up the engines testing them.....sorta lingers.
My sister did that once and was about to drive off right about when we both noticed the car seemed a lot cleaner inside and “since when do you wash out the ashtray???”, about simultaneous with the owners showing up too.
It was to damn funny, two champagne edition VW rabbits and the keys fit and started it. Turns out around 77/78 the average VW key would fit something like every 12th one made...
Your post reminded me of an oldie but a goodie.