Barack Obama gave the final speech of his presidency last night, and while some of us were busy sobbing into our wine glasses, others were sleuthing their way through the night's biggest mystery: Where the heck was Sasha Obama?

Twitter users noticed the first daughter's absence before the speech even started.

As curiosity mounted, so did the crazy theories.

Some people suggested the youngest Obama daughter had a ~*top secret*~ role to play.

Some suggested she was preparing for the upcoming administration...

...while others thought she needed private time to plot her revenge.

Some people suggested the 15-year-old was simply busy.

But this guy got the closest of anyone.

The White House confirmed that she stayed behind to study for a test the next day.

Or at least, that's what she told her parents...

Party on, Sasha.