Lynne is in a pub. She watches George and Sammy have a conversation and thinks to herself that they are talking about old times. She then looks at an older couple of gentlemen and thinks they must be talking about ancient times. Finally she looks at two very old gentlemen and thinks they are talking about prehistoric times.
Lynne is in a pub but has decided to go for the punk chic look today. As this is 1982, this is Lynne finding out about punk about 3 years too late. She is trying to cling to her youth by dressing like this. Punk is over and it is now all about post punk. Perhaps she is taking fashion tips from Iron Maiden with this look. The tight trousers and studded belt have a heavy metal feel to them.
Lynne is right; George and Sammy are reminiscing about old times. The two of them have known each other for a long time and they like nothing better than to talk about the good old days when they were chasing women back in the early 70s. Fresh out of university, the world was their oyster. That is until one day when they went to a party and Sammy struck up a conversation with a pretty short haired girl with massive earrings and the same name as him. So ensued a loving relationship and a spiralling drink problem.
Lynne is making assumptions about the other two conversations. That is of course unless the first two old men are archaeologists who are reminiscing about the time Howard Carter discovered the tomb of Tutankhamun. The final two gentlemen must be paleantologists and are discussing the evolution of the dinosaurs into birds. It's amazing the variety of conversation you can get in a local pub.