I hire cars quite a lot (cheaper than owning one in London!) and over the decades it's been hundreds. Getting into a new one is always exciting as, without asking the agent, you try to find a. where to put the key/fob b. whether you have to put a foot on the brake before it'll turn over c. discover the exact location of the wipers AND washer (this is really important) but without doubt d. is the winner, which is try and get any kind of sense out of the 'infotainment system'.
Fortunately a lot of car makers have at least reverted to a central knob which defaults to being the volume. You can easily and quickly use it! Oh joy! But that's where it stops being fun. Just working out what is an active button and what is simply a small piece of inert trim is enough to drive you mad.
And then there's pairing your phone... Some cars seem to want to pair with your phone, or any phone that happens to be near.
Then there's satnav. Figuring out how to adjust the volume of the voice over the ducking music...
Don't get me started..