I force my children to watch Poirot.
I'm under no delusions that Z might actually enjoy them--he thinks they're boring (murder is SO 1920's)--but I try to keep him involved.
Yesterday I paused the show to say, "Okay, so you've met all the characters. Who do you think is going to die? Who would you like to murder?"
Z says in the most perfectly tired voice, "Whoever made this movie."