The Pocket Veto Case was a case in which President Coolidge allowed a bill passed by Congress to expire without signing it after Congress' adjournment.
The question was whether the bill was law considering the Presentment Clause in Article I. (Image 1)
The Clause reads like an LSAT logic game, but the Court held the bill did not become law.
The important part for Kagan's opinion is the quote's context: (Image 2).