Un calembour is a play of words with words sounding alike.
Here is one from Jacques Prévert:
Tous les matins, je me lève de bonheur.” meaning “Every morning I wake up happy.”
Usually in French people say “Tous les matins, je me lève de bonne heure. “Every morning, I wake up early.”

Do you know any in English?

What do you call a play of words with words that have different meanings. I have a favorite pun, but other people have said it has no other meaning. What do you think?
Les preservatifs preservent tout, tout sauf de l’amour.
I was thinking that chemical preservatives preservent things, but you don’t have to preserve your love if you have a preservatif. I guess that is a pun only to people who think of preservatives with the English meaning.

Americans used to put chemicals in foods and liquids to prevent them from spoiling. The preservatives preserved the foods on the shelves in the supermarkets. Then people started saying that the chemicals could cause cancer. They took the chemicals out of the foods, and now many kinds of foods have the words “No preservatives”. What I don’t understand is if there are no preservatives in the food, what stops the food from spoiling?

I really want to ask a question that I forgot to ask earlier when this lesson came out. Your mother is asking you where you are going and who you are going out with. How do you say in French “I’m going to hang out with my friends”?