Laughter is a natural human response to various stimuli, such as humor, joy, or amusement. It often reflects a positive emotional state and can be contagious, spreading happiness to others around you. Without further context, it's challenging for me to describe the specific situation that led to your laughter or who understood its real meaning.
If you'd like to discuss a particular situation or have any other questions, feel free to share more details, and I'll do my best to assist you!