A mistake you laugh off every time eventually stops being funny to everyone else.

The joke works the first time because it shows you noticed. Repeated, it starts to look like a substitute for changing anything, and the people affected move from amused to patient to quietly annoyed, usually without telling you. Humour that was warm becomes a way of ending the conversation before anyone can ask for something different.

Pick the thing you always laugh about and skip the joke once. Say what you will do instead, then do it. The laugh stays available, and there probably will not be a next time to use it on.