"I bid you now skidoo"
If the Happy Homemaker's collection of vintage valentines isn't enough for you, Michele Catalano has more here. She calls them creepy, but some of them are kind of sweet, in a weird sort of early 20th century way. (Not the one with the electrocuted puppy, though. That's just horrible.) And they had anti-valentines back then, too. More here.
(Hat tip: Ace of Spades.)
In the same sweet Valentine's Day mood, Michele doesn't hold much hope for Cathy and Irving's future. (Not for the faint of heart or tender of ears.)