I must be behind on internet speak... Never heard of this kind of e-mail behaviour being called a meme. Spam, yes, not meme.
A meme (pron.: /ˈmiːm/; meem) is "an idea, behavior or style that spreads from person to person within a culture." A meme acts as a unit for carrying cultural ideas, symbols or practices, which can be transmitted from one mind to another through writing, speech, gestures, rituals or other imitable phenomena. Supporters of the concept regard memes as cultural analogues to genes in that they self-replicate, mutate and respond to selective pressures.
It's the action of creating the images that spread, along a theme is the Meme, not the spreading of them.
My mind is ticking over with plays on the 'Wait for what?' theme...