Fluffy Puff Mayo first showed up in the short toon Meet Marshie!. It can also be seen in Where's the Cheat? and recently reappeared in the StrongBadEmail/the bet. The KoT has it in his pantry. It also appears as an advertisement before A Decemberween Pageant.

"Made From The Best Stuff!"

--

As I look at the bottle of Snapple in my hand, I see that it claims to be "Made From The Best Stuff On Earth". Coincidence? I think not. Hmmmm