A lot has changed in the last 20 years - mobile phones, the internet, Donald Trump's hair... oh, maybe not.
So it's no surprise that what was once deemed pretty sensible popular opinion, now in hindsight looks a little short-sighted.
A recent Reddit thread sought to highlight some of the finer examples...
1) Online Dating
WIN-Initiative via Getty Images
The Proof
2) Terrorism
The Proof
3) 'Odd' career choices
The Proof
4) Gay Marriage
The Proof
5) The Trump
The Proof (well, kind of)
6) Pluto
The Proof
7) Office Stationery
The Proof
8) The Media
The Proof (erm... the jury is still out)