I dunno if it counts but some busker in a tunnel was singing, "Time is Running Out" and I sang it with him. He thought it was because I had no money but I gave him 20p for singing that, then I asked him if he knew any more Muse songs and he said he hadn't heard of them, to which I corrected him that he just sang a Muse song. He just looked around waiting for me to leave, which I eventually did.