Decades ago when I lived in a flat with other students, one asked if we could send a card to a friend of hers who was going to get married, a guy. Send some desperate card as if you're his old lover or admirer.
I thought it was stupid, but obediently sent him a card. I don't even know who he was. I bought a card with a goat that had a flower in his mouth and wrote: So and so remember me and don't marry that silly goat! She said that they were super happy with these dumb cards lol.