The use of the 'not' joke. Primarily an American idea, the 'not' joke is American sarcasm at its finest.

The lack of sincerity in sarcasm is usually conveyed through tone of voice, but with Americans and their famed linearity of thought, sarcasm often escapes them. Therefore, to make their statement seem sarcastic, they overtly announce it so, by sharply adding 'not' on the end.

Painfully guilty of 'Don't Explain the Joke.'

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.