This is someone who pretends to be your friend, but deep within there mental darkness they ninja stealthily plot against you to cause you and/or those close to you some harm and end up doing so.

The phenomenon of having to come out as bisexual to the same person/people repeatedly because they assumed or hoped that your sexuality was a "phase." Refers less to the holiday and more to the 1993 Bill Murray comedy film in which the main character experiences the same day over and over.