My first passenger turned out to be a commercial pilot (A Citation driver IIRC). Sensibly my friends didn't tell me this before hand, and also hadn't told him that I had only just got my PPL. Good move! I have subsequently carried lots of people aloft. Some of them complete strangers, at least one of whom had never flown in anything before, and others including PPL's ,CPL's and ATCO's.
Only one, from memory, really didn't enjoy the experience. He was a PPL at a local airfield who had been "egged on" by some mates, it was also a rather bumpy afternoon, and he announced his displeasure just as we were clearing the upwind end of the runway. A very short circuit ensued and I had him back on terra firma in just over a minute. I learned a valuable lesson that day - never take anyone flying unless They want to. And also pick a calm evening if you have any doubts about their enthusiasm.