In the book "10 lb Penalty" by Dick Francis, the author advises readers to be cautious about humor, particularly in sensitive contexts. Making jokes in front of police can be particularly risky as they are often perceived as lacking humor. Additionally, political jokes can be problematic, as they may unknowingly offend others, especially those in authority or opposing views.

Francis highlights the importance of being mindful of how comments may be interpreted. A simple expression, like an eyebrow raise, can signal offense even when none was intended. He underscores the idea that if there is a chance someone might take offense, it's wise to tread carefully to avoid misunderstandings and conflicts.