Related Clues:

• Foolish mistake
• Go off track
• Act humanly
• Slip a cog
• "To ___ is human ..."
• Show you're human
• It may be done on the side of caution
• Prove one's humanity?
• Piffle
• Bozo
• Prove to be human?
• Bad thing to have showing
• Need to be set straight
• Mess up
• Docking spot