Have you ever received a Boo Wario message on the Mario Wiki? If you have, then post your experiences here! I have received a Boo Wario message myself - apparently he got through the combined unicorn Magic of Twilight Sparkle, Sweetie Belle and Trixie Lulamoon (check my talk page). Thanks @LeftyGreenMario!
I was the one who released Wario's spirit into the world. It was trapped in the bag of chips that Wario, being a glutton, stuck his huge head into. Poor idiot couldn't yank himself back out of it.