Joe Berkowitz believes Halloween is a death kiss for new relationships:
Halloween travel combines all the worst elements of vacation traveling, only now you’re covered in foam and latex and you may not have any pockets. This makes for a particularly turbulent emotional state to navigate for two people who are still new at being together. ... And just like on vacation, the way you respond to contingencies and surprise stressors reveals a lot about how you function as a couple. It will either bind you together against a world conspiring to harsh your buzz, or it will turn you against one another.
(Photo from About.com)