Related Clues:

• Ad lib
• Seat-of-the-pants schtick
• Fly by the seat of one's pants
• Stray from the script
• It's made off-the-cuff
• Ignore the cue cards
• Avoid the lines?
• Spontaneous remark
• Unscripted
• Remark that might get one in trouble
• Deviate from the script
• Ignore one's lines
• Perform without preparation
• Abandon the plan
• Speak without a script