Why do people laugh when someone says doo doo?

The word "doo doo" is often associated with feces or excrement, which can be considered humorous or silly in certain contexts. For example, referencing doo doo in a comedic or lighthearted way can elicit laughter due to the element of surprise or the unexpectedness of the topic. When used in a playful manner, it can create a sense of shared understanding and camaraderie among those who find humor in such references. Additionally, the word itself sounds childlike and nonsensical, which can add to its comedic value and evoke a sense of nostalgia or innocence. Laughter in such instances can be seen as a form of social bonding or a way to release tension and find humor in everyday language and expressions.