"That One Time at Band Camp" is a popular phrase originating from the movie American Pie, where a character named Michelle Flaherty shares a humorous and memorable story about her experiences at band camp. The phrase has since become a cultural reference, often used to imply a funny or embarrassing anecdote. The concept of band camp typically refers to a summer camp for students involved in school bands, where they practice music, learn marching techniques, and participate in various activities. These camps are designed to enhance musical skills and foster teamwork among young musicians.