Plants vs. Zombies.
What's your favorite part? The zombies with butter on their heads? The zombie dolphins? The whole mad thing? It takes a company like PopCap -- purveyors of unicorn-infused digital crack like Peggle -- to invent something that just has to be an April Fools' joke but, we swear, totally isn't.
Brace yourself, then click through after the break for animated insanity.