I've lost count of how many old friends/acquaintances I've seen in the audience of chat shows like the now-defunct Trisha.
One of my former classmates from secondary school was a guest on Trisha (about 7 years after we lost touch), having become a drug addict and prostitute. It was a real shock to see her. I reported this to our former Head of Year when I spoke to him shortly afterwards. All the unsympathetic sod had to say was ''How much does she charge?''
I also saw my former sister-in-law as one of Jeremy Kyle's guests - I hadn't seen her for 15 years, so got a bit of a shock! She hadn't changed one bit.