It's pretty simple, all you have to do is say something that everybody should remember and that it could bring back some good old memories.
Rules are simple:
1-Start each sentence with "Remember when..."
2-This is to bring back old memories, so don't talk about stuff like 9/11 just to be a dick
3- you can talk about everything, from skiing to anything else.
4- you have to remember it yourself to actually talk about it.
Here's a start:
Remember when X-games first started?