It is OK to have a good time. It is fun to goof off and be silly. Not only is laughing fun, it is medicinal. I highly encourage letting loose and having a good laugh as often as possible. That being said, like all things, there is a time and a place for it. There is also a time and a place to set all kidding and goofing off aside and to act like an adult. A time where the laughter and fun need to be put on hold so that you can take care of the important things.
Any time there is an argument or disagreement taking place, fun and games need to be set aside. It doesn’t matter if you are presented with the best opportunity of all time to slip in a witty and humorous comment. You need to holster it and stay focused. It may seem like a good idea or a good opportunity in that moment, but I can assure you that it is most likely not going to go the way you are hoping. It will likely have the opposite effect.
The last thing you want to do during a serious situation or conversation is give people involved the impression that you are not taking things seriously. It isn’t just immature and rude, it can also end up being offensive and end up making what is already a difficult situation or problem worse. All you are doing is adding to the problem at hand and prolonging the resolution. Take a deep breath if need be and focus. That laugh you are aiming for is not worth the possibility of making things difficult or worse.