Related Clues:

• Fail to be perfect
• Show fallibility
• Overthrow a base
• Deviate
• Goof up
• Make a boo-boo
• Bobble
• Create a snafu
• Behave humanly
• Go off course
• Do this to prove you're human
• Throw angrily
• Lapse
• Be human
• Blow one's lines, e.g.