It's the end of senior year, you have nothing left to loose, so why not pull off an epic prank? Grace Aroune, a senior at Iroquois High School in New York, pulled off a legendary prank by inviting SNL star Bill Hader to give life saving instructions to her classmates. The graduating trickster told her classmates that she invited a firefighter through the Make-A-Wish Foundation to talk to the class, but little did they know it was Mr. Hader in disguise. Later, the comedian hijacked the PA system doing his iconic Stefon character from SNL and then rushed the basketball court to deafening cheers. PHOTO: See the anniversary pics of SNL stars Students were overjoyed and showed their gratitude on Twitter. "Shoutout to @graaaacie_ for planning the best senior prank with Bill Hader from SNL #bestseniorprankever," one student shared. "Big shoutout and thank you to Bill Hader for taking time out to come to Iroquois today!" another tweeted. "@jimmyfallon thanks to Grace Aroune Bill Hader … [Read more...] about Bill Hader Participates in Senior Prank at New York High School: Watch the Hilarious Video!