Paramore's Hayley Williams Recalls 'Ginormous' Halloween Costume

'The head was absolutely huge,' she says of her Casper getup.

It's no coincidence that on the weekend of Halloween (arguably the scariest of the holidays — save for Groundhog Day) mtvU is airing their Ulalume Music Festival special featuring [artist id="150284"]AFI[/artist], [artist id="3066140"]Kid Cudi[/artist], [artist id="3200362"]Dead By Sunrise[/artist] and [artist id="1968732"]Paramore[/artist]. The show, whose name comes from an Edgar Allan Poe poem, is a showcase of artists who embrace the dark aesthetic and supply the perfect soundtrack for Halloween night.

During the fest, MTV News caught up with the Nashville natives Paramore and asked about some of their favorite Halloween costumes and memories. After all, they did write that song for "Twilight," so they should be experts of all things macabre, right?

"One time someone made me a Casper costume because 'Casper' was my favorite movie," Paramore singer Hayley Williams shared. "It kind of looked like ... what's his name from 'Ghostbusters'?"

Drummer Zac Farro tried to help. "Bill Murray?"

"No, marshmallow dude!" Williams said, referring to that frightening Stay Puft Marshmallow Man. "I looked like that, and the head was absolutely huge — it had these huge plastic eyes and I could see out of the bottom of them. It was legit; I could probably go to Disney World with it but I looked ginormous."

Zac described a Halloween highlight that involved him and brother/ Paramore guitarist Josh Farro. "When Josh and I were little, we weren't allowed to trick-or-treat — my mom thought it was Satan's day. But we saw Coneheads ... it was like a family of Coneheads — it was amazing."

"Wow, I probably would've gotten scared!" Williams laughed.

For more from the "New Moon" cast and to see an exclusive clip from the film, check out MTV's "Ulalume: Howling at New Moon" on Friday, October 30, at 9 p.m. ET — and check at 10 p.m. to see the clip exclusively online!

It's Halloween Week, the spookiest time of the year and also the most fun. So as the leaves fall and it gets a bit colder, we here at MTV News decided to pay homage to the holiday by rounding up some of your favorite celebrities' Halloween memories and costume ideas — some even offer advice on how to dress up like them this year. So brace yourselves: You're in for one horrifying week!