But we asked our Facebook readers who they had met who had been pleasant to them – and loads of suggestions were made.
Here are some of those who make it into our nice hall of fame.
10. Steve Cradock
Ian Skippy Slade said: 'I met Steve Cradock from Ocean Colour Scene in the Portsmouth City Museum!' Photo: Alex Shute
11. King Charles
King Charles - then the Prince of Wales - is pictured while Captain of HMS Bronington. Two people mentioned him - Tomo Hawk posted: 'Met him at 19 when in the navy and he was lovely. Years later, met him again and he remembered my name. Genuinely nice guy.' Maggie Taylor said: 'Met King Charles years ago in Portsmouth when he was in the navy, very nice person.' Photo: UNKNOWN
12. David James
Marcus Caruth said: 'David James at the Isle of Wight festival .. geezer.' Photo: Habibur Rahman