Possible Clues:

• Unusual pastry, split evenly by calorie
• Unlike the rest, I play-act outrageously
• Nonstandard
• Incorporating one act, 'Play That Goes Wrong' is unusual
• Out of the ordinary
• Play with Act I junked? That's not usual
• Unusual play, Act I being modified
• Unusual form of capital Y
• Play, Act I cast finding unusual
• Unrepresentative or uncharacteristic