Marriage advice usually sounds painfully predictable: communicate, compromise, never go to bed angry. But couples who have been together for years often develop far stranger—and sometimes far more effective—ways of keeping the peace.

From settling movie-night indecision with the threat of Sharknado to defusing arguments with imaginary karate fights, these “unhinged” marriage hacks may not appear in any relationship handbook. Yet beneath the weirdness is a surprising amount of wisdom about sharing a life with another person.

Here are 30 unconventional marriage tricks that real couples swear by.

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