70s drive-in movie about a rich boy befriending his kidnappers

This I definitely remember at the drive-in. A rich boy is kidnapped but, he has a crush on the female kidnapper. They were scaling the outside of his house and tells her “I like you better than my mom but, she has bigger boobs.” The female captor looses her balance and almost falls. I laughed my butt off!  What was the title?

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