Sleeper Meme

A Sleeper Meme, much like a regular meme, is an attempt at cultural humor. However its distinction lies in that the material of the meme has been around for a long time, but lies dormant, mostly forgotten. Once rediscovered, its sudden explosion in popularity activates its audience much like a code would to a sleeper agent.
ALL Spongebob memes are Sleeper Memes.

Hey man, do you remember the Fitnessgram Pacer Test?

OH dude I remember that! That's such a Sleeper Meme!