Movies since a long time have been a good reason for dating. But now when its way too common people dont pay much heed to watch colors of emotion on screen, together. Its not that people have turned emotionless, for they can never be. No matter what you’ll always find girls and some of the guys crying while watching movies. hehe
If you are watching a movie on some special occasion like a birthday of your loved one then i suggest adding an extra angle to the seemingly normal experience by making it a bit personalised. All Cinema halls have options to show ads before the start of a movie. I suggest showing up a dedication frame or a small video before the movie and to play the birthday song in the background.

Even if many girls dont like PDA, there is no such girl who hates to experience it. And for guys, PDA is more of an assurance of the relationship. So this idea work both ways. Guys try it on… and dont forget to carry tissue with you, girls with overactive tear glands may become a bit embarrasing.