I have nothing but good memories about my humble ppl flying. I've flown SEPL VFR in 7 different countries including mountanous regions. My fridge door is thick with pictures that my friends have taken from our trips. I sometimes speculate whether I might have just as much good memories from my flying as people with 10 times as much hours.
Still:
1. Airport staff checking my papers, e.g. pulling something as idiotic as my radio license out and checking it. If you care to know then I'm talking about EKRK. Shame on you.
2. 21 year old instructors with huge watches, fancy sunglasses, white shirts, epaulettes and a really small ego.
3. Pilots who think the size, make or price of their watch matters.