The Act of going on any sort of spree (Vandalism, Killing, Sexual, Screaming) after realising that you have just read the 7th and last Harry Potter book, and there will be no more.
Did you hear about the Massacre in that school down in Yorkshire? she killed 206 people with a broomstick with razorwire for bristles. Aparently, it was Post-Potter Psychosis. I blame Manhunt 2, but nevermind.