Twitter users jumped right on the ongoing trend of "You had to be there", posting pictures that encapsulate certain times in their lives. Some of the posts can involve things from a few years ago, while others go back decades—and each of them is accompanied by the feeling of nostalgia that's attached to the pictures.

Plenty of people are jumping in on this trend, from regular folk to official and certified accounts, each post presenting a blast from the past that was somehow special for them, be it TV series that aired a decade ago or a newer movie that's only a few years old. Time is a flexible thing, and the trend reflects different periods that people grew up in.

And there's an unspoken rule to these posts—you shouldn't add a description to the pictures. Basically, if you know, you know. If you don't, don't worry about it. The variety of the posts—containing old movies, physical items, or discontinued media—apply to people of different ages. So, there's a bit of everything for everyone.