Lois's line about trying to cope with Clark always flying off by thinking of him as a doctor or firefighter on call...remind anyone of something? Yep, Lois's tearful complaint, toward the end of Superman II, which leads Clark to give her an amnesia-inducing superkiss to spare her the pain of a relationship with him:
"It's like being married to a doctor!"
After my parents and I saw the movie when it first came out, my mom jokingly told my dad she could identify with Lois.