To give a serious answer to this, quoting Wikipedia:
A meme is an idea, behavior, or style that spreads by means of imitation from person to person within a culture and often carries symbolic meaning representing a particular phenomenon or theme.
Hence, the whole characteristic of a meme is that it is always exactly the same thing. It’s like a running-joke, whose main attractive property is that everybody is already familiar with it (e.g., the concept of pedantry is a meme on our forum).