There's 24 hours in an adult Valentine's Day, meaning there is a lot of time and opportunity for encore performances. These hilarious boxed Valentine cards for adults translate what Do Not Disturb signs actually mean. The Doing It. Done It. Will be Doing It Again Valentine's Day cards are funny, but more importantly, they are a way to set the mood for the day. Forget the dinner and movie. Give this card and the gift that keeps on giving. Just remember to buy some energy drinks and stock up on protein bars, then celebrate Valentine's Day like the stallion you are.