Do you believe in ghosts?

Knowing I love all things scary, my brother-in-law sent me this video at the end of last week. Shortly after, I started seeing it everywhere!

The footage in question is from the inside of a school in Ireland. It shows what appears to be a ghost causing a ruckus inside the school's hallway in the middle of the night.

This was captured on October 1st around 3 in the morning.

What do you think - is this a prank or the paranormal at work?