This prank is so simple, but yet so delightfully clever and insatiably irritating for the target all at the same time.
It's what pranks are made of.
Santa Barbara High School principal John Becchio strolled into his office bright and early one morning, he was surprised by the presence of four mariachi singers who had occupied his private room.
Not only did they serenade him on the spot, but they followed him around school for a whole hour.
Well done, senior students. Well done.