Does Hallmark make cards for that?

Today is the 41st wedding anniversary of my inlaws. (Congrats, you two! Don't you want to take us an another exotic vacation to celebrate?) So, just after supper, we decided to treat (?) them to an anniversary serenade, sung to the tune of Happy Birthday. Had to leave a message, but when they pick up their voice mail later tonight, they'll be hearing M-cat's voice: Happy University to you! Happy University to you!, followed by shrieks of laughter from her siblings.