How to tell if a movie has a post-credits scene or not?

I don't wanna miss :( Movies like Marvel Avengers and Battleship has funny scene after the loooooooooooooooooooooooooooooooooooong credits. Sometimes I need to leave the theater after the movie ends because 1, need to pee, 2, could not stand the cold temperature, 3 bored of the loooooooooooooooooooooooooong... show more I don't wanna miss :( Movies like Marvel Avengers and Battleship has funny scene after the loooooooooooooooooooooooooooooooooooong credits. Sometimes I need to leave the theater after the movie ends because 1, need to pee, 2, could not stand the cold temperature, 3 bored of the loooooooooooooooooooooooooong credits. I watched Battleship on DVD and I skipped the whole credits and saw the post-credits scene. But for Avengers, I watched in the cinema and I missed it :( I only saw on Youtube randomly searched.
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