The alternative rock group was performing in Albuquerque last week (ends26Apr15) when Lacey stumbled over the words to their 2006 track Millstone.

The star shocked the audience when he asked a gig-goer, "Do you have the lyrics on your phone there?... If somebody could buy me a lyric book and I'll just put it up here and put my old man spectacles on."

Brand New are currently touring the U.K. and Ireland playing a series of intimate dates, which end in Dublin in September (15).