Going for a curry after a night out.
I grew up in a small town in the 80s and if we went out for a meal it was mostly Berni Inns type places. The only curry I'd tried prior to going to University were the Vesta boil in the bag ones with the sultanas in, which were just known by the generic term 'curry.' I went for an Indian with some new friends in my first term and remember not knowing what a single item on the menu was. One of the girls was from London, and she very confidently ordered a lamb rogan josh with keema nan, and I was blown away by her sophistication.
(That's not to say Indian restaurants can't be posh. I have been to some very high class ones since. The student balti houses I frequented in the 90s, however, with their family-size naans as big as the table, were not posh. Delicious, but not posh.)