Country star Carrie Underwood couldn't resist playing a prank on Hunter Hayes on the last night of their joint tour on Saturday (18May13) by arranging for a screaming goat to accompany his performance. The Somebody's Heartbreak hitmaker joined Underwood on the road earlier this year (13) as the opening act of her Blown Away Tour, and while playing his final gig in Alberta, Canada, the American Idol star got the best of her new pal by calling on engineers to project video footage of an angry goat on a large screen to the right of the stage. The clip appeared several times throughout the show as he sang Light Me Up, but, ever the professional, Hayes took the incident in stride and continued playing even as the audience chuckled. All jokes aside, Underwood later took to Twitter.com to thank Hayes for the laughs and shared a video of the gag with fans - she wrote in a post, "Hunter Hayes' last show on the #BlownAwayTour = time for pranks! Tee hee! Thanks @HunterHayes for being on the road with us! You will be missed!"