Fans attending Los Angeles radio station KROQ's "Almost Acoustic Christmas" concert at

the Shrine Auditorium on Friday experienced a surreal moment when

rapper-turned-thrasher Vanilla Ice made a surprise appearance during a set by

metal-influenced punk band the Offspring. Appropriately making his entrance

during their performance of the satirical radio hit "Pretty Fly (For a White Guy)," the

self-proclaimed "white-boy rapper" Vanilla Ice (born Rob Van Winkle) stayed on

stage for a collaborative rendition of "Too Cold," a remake of his early '90s hit "Ice Ice

Baby." The next night of the two-night concert series -- which included sets by hip-hop

thrashers Korn, glammish grunge rockers Hole, ska rockers Reel

Big Fish and quirky popsters Barenaked Ladies -- also featured a surprise

collaboration, as Smashing Pumpkins singer Billy Corgan joined

synth-pop icons Depeche Mode during their set to perform "Never Let Me Down

Again."