be as nice as pie
slang To be surprisingly or unexpectedly pleasant. Mr. Stewart may seem crotchety, but actually he's as nice as pie—he's helped me carry my groceries many times. No, Mary won't help you, but don't worry, there are a few other people in Payroll who are nice as pie. I expected her kids to be total terrors, but they're actually as nice as pie and very well behaved.
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