Dunno if anyone else is doing this sort of thing but I mostly just want to show off. Inside each card, for my boyfriend and girlfriend respectively, is a message encoded via cipher wheel, as well as the repeating pattern they'll need to use to decrypt the message(they each have different decryption patterns). They each have two digits of the three-digit safecode in their encrypted cards, sharing the middle digit. Once they figure out how to use the cipher wheels and get the safe opened, I put books I think they'd like inside! Anyone else up to some puzzle shenanigans to frustrate/annoy your significant others?
Our school has a Valentines service that sends anonymous notes for us. I sent 5 notes that had incorrect song lyrics. My friends had to do the Winterharvest comparing differences thing to find the message...