Possible Clues:

• Enthusiastic yes
• 1966 Mary Martin musical
• Emphatic assent
• Enthusiastic reply to "Who wants ice cream?"
• 1966 musical about a marriage
• Excited answer to 'Who wants dessert?'
• 1966 Mary Martin/Robert Preston musical
• "Me! Me!"
• 'My Cup Runneth Over' musical
• Mary Martin musical