I think the biggest surprise most Wingly PPLs will get is when confronted by an aggressive cost sharing passenger who demands what he paid for whilst saying, "it looks alright to me" ......
had exactly the same conversation over 20 years ago with a ppl hirer - who is now a BA Captain...lol! (pardon the teenage vernacular) when I called off a flight to Le Touquet with him when he was hours building and I was a QFI, due wx, because despite the Cat 1 conditions at destination, he hadn't noticed the OVC010 with a surface temperature of 01 degrees for a flight planned at 2500' in a PA28 (not certified for known icing).....ok he wasn't a BA Captain then, but what was he thinking? I was the hired help and he was paying for the flight!
I'd like to think he's learned something since