A couple was arrested in Manchester, United Kingdom during a screening of Batman v Superman because the guy's little Man of Steel leaped into the woman's Batcave mid-movie. 

According to The Mirror, movie theatre (it's the UK) staff confronted the pair, who were enjoying some superheroic sexy time as Lex Luthor orchestrated a showdown between Superman and Batman. Hopefully, they waited until after (yet another) sequence of Batman's parents dying.

They were presumably turned on by all those longing stares between Supes and Bats. Or maybe they were bored by the movie and found a different way to entertain themselves.