Related Clues:

• Musical phrase
• Ignore the cue cards
• Avoid the lines?
• Spontaneous remark
• "West Side Story" gang leader
• Unscripted
• Remark that might get one in trouble
• Deviate from the script
• Comedic spiel
• Ignore one's lines
• Perform without preparation
• Speak without a script
• Surprise one's costar
• Do improv
• Jazz accompaniment