Rebecca Black is exhibiting typical symptoms of a mind controlled zombie. She has severe problems with amnesia and has to remind herself which day of the week it is.

In the song she says “Thursday” and “Friday” twice but really the underlying meaning is “yesterday was thirsty Thursday, today is Fried Day Friday”
Obviously she is subliminally telling people to go get distracted by getting drunk so they won’t interfere with the Illuminati’s plan to eat your brains.