After 25 years, ThinkGeek finally brings the infamous Stay Puft marshmallow brand to life with an officially-licensed collectible box of “Caffeinated Gourmet Marshmallows” which may or may not paranormally increase in size and attempt to destroy the world. [thinkgeek.]
I think that the real fist Internet meme were the Coke Machines that were connected to the Internet to let Programmers know the status of the Coke machines because "no Real Programmer can function without caffeine".
For more information about Memes, see The Internet Meme Database on Know Your Meme