What can porcupines do to a person for no reason?

Porcupines generally do not pose a threat to humans unless they feel threatened or cornered. If provoked, they can use their quills as a defense mechanism, which can lead to painful injuries if they make contact. However, porcupines are usually shy and will avoid human interaction, preferring to retreat when faced with danger. Thus, they are unlikely to harm a person for no reason.