They gained a reputation by the speed in which they spread, but memes have made their impact through being memorable. We wouldn't keep coming back to them if we didn't enjoy them, after all. Meme crazes may come and go at the whim of the algorithmic gods, but true classics stand the test of time. Who knows which of the memes of tomorrow we'll be wistfully reminiscing about, sat in a rocking chair at the nursing home?