When you get bitten by a zombie, you turn into a zombie. It's one of the cardinal rules of the undead, but what if you're a sentient plant? Are you immune? Says who?
Well, says Popcap, obviously. In its smash hit Plants Vs Zombies, plants don't seem to be able to catch the undead plague. One would assume that creatures with mouths, eyes and quirky facial expressions would have some sort of infect-able nervous system lurking beneath their leafy green skin, but no; they are safe.
But what if they weren't?