When set loose I fly away, Never so cursed As when I go astray.

Why this works

This riddle cleverly plays on the dual meanings and associations of the word "fly." When a fart is "set loose," it literally escapes from the body and can "fly" through the air. The phrase "never so cursed as when I go astray" hints at the embarrassment and potential social faux pas that come with a fart that isn't contained, emphasizing the humorous and often taboo nature of flatulence. So, the riddle captures both the physical action and the social implications of a fart in a playful way!