Nothing says, "Love me forever," like a Valentine's card depicting a vomiting Boomer, a tongue-twisted Smoker or a weeping Witch from Valve's cooperative shooter, Left 4 Dead
. Keyword there is "cooperative." Valentine artist beavotron posted a handful of Left 4 Dead themed cards
over on the Penny Arcade forums, allowing anyone to print and give them to a (real or imaginative) significant other.
Just know that if your lover doesn't accept the zombified sign of love, your relationship just wasn't meant to survive.