From a CNN story.

Christmas
Front: "Spread some holiday cheer." Inside: "Or drink alone. Who am I to judge?"

Mother's Day
Front: "When I think of you, Mom, I swell with pride." Inside: "At least I hope it's pride. Otherwise, I'm pregnant again."

Wedding
Front: "Did I hear wedding bells?" Inside: "Or was that the natural disaster siren? Sometimes I get them confused. Whatever it was, it was loud. Congratulations ... or take cover!"