Spy Kids

Answer: When he told her that he knew about her still wearing diapers. He did it to get back at her for being so mean to him and they decided to call it even.

Continuity mistake: Lifejackets appear magically on the two kids when they emerge from the inside of the weird bubble ship. When they re-enter, they magically disappear. Likely, they simply didn't want the actors to be on a boat without a lifejacket, but there could've been a more graceful way to do it. (00:22:50 - 00:24:05)

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