(My only Valentines day related joke) If the Swan symbolizes happiness, what bird symbolizes true love?
The Swallow.

The other men smile and one of them responds: “Thats funny because I love her so much that I got her s...

Be rude- Unless you know your other half has the type of humour that will really appreciate a bad joke, don't poke fun at their expense.

Hit a sore spot- Your loved one has probably shared a lot of their experiences with you and not all of them will have been pleasant. Don't make a joke out of something that's caused them pain or embarrassment. Even if it seems like enough time has passed for it to be funny, chances are they won't feel the same.