Where I used to live a few years ago I never seemed to get many b/day cards on the day, I used to get them all on the 14th. Then I found out my nice kind postman held them back deliberately because he thought they were vallentines cards. When I spoke to him about it he said "Gawd, I did think you were a popular lady" -- Doh!
To be truthful I didn't get any vallentines cards anyway.