The Foo Fighters gave fans a treat on Friday night when they covered some Metallica with the help of a ten-year-old fan. Frontman Dave Grohl picked the boy out of the audience and brought him on stage. He then handed him a guitar, and they performed Metallica's track, Enter Sandman. Afterward, Grohl gave the boy the instrument as a gift, and jokingly threatened him not to sell it on eBay. He later wrote on Twitter, "lookout world, next generation of rockers coming soon to an arena near you."