Lemons and limes seem like pretty similar fruits unless you're actually a lemon or a lime, because their societies are so different they consider their species to be superior to the other- which is why they've been at war for centuries.
As the Citrus Wars progressed a sour lime scientist came up with a surefire way to cripple the lemon forces and eliminate their sunny yellow species forever- lime disease.
I'm pretty sure that's what this Napalm Soda Comics strip is all about, either that or it's just a punny comic about lemons...yeah, probably that, eh?
-Via Geeks Are Sexy