My mom used to send out these cards for holidays, birthday's etc... that weren't funny - but PUNNY. Like "If you are happy and you know it" on the outside and then on the inside of the card "clamp your hams" (and a picture of a ham with a clamp on it.
Well - the classic was the Halloween card with the Daschund dressed as a vampire on the front with the punch line... "Happy Hallo-weiner." For the better part of 10 years this card has been exchanged (new one each year- we're not organized enough to recycle the old one again and again) each Halloween.
So - to all of you today.... Happy Hallo-weiner