A meme is a piece of culture that might reproduce in an evolutionary fashion, like a hummable tune that someone hears and starts humming to themselves, perhaps changing it, and then others overhearing next. In this view, any piece of human culture can be considered a meme that is spreading (or failing to spread) according to evolutionary forces. So we can use an evolutionary perspective to consider the spread of:
This reminds me of something quite silly but I think it's worth mentioning. While this term was later adapted to refer to what we today call a meme, it was still in use a this definition before and did circle through media, which made the media retroactively very comedic through the redefining of the word meme. My favorite example of this is the 2013 game Metal Gear Rising: Revengeance, which has a plot points revolving around how the only thing that truly matters to a persons self and decisions is memes and the ideas that their culture pass on to them. But with our modern definition, all the thoughtful speeches throughout the game become unintentionally very funny.