A 60-year-old high school dance teacher in Canada has left her students with one final lesson before retiring.Shirley Clements went out with a bang, nailing a hip-hop routine to Bruno Mars' hit song, "Uptown Funk."Video of the routine posted by Artistic Edge Dance Academy on YouTube shows her students trying to keep up with her quick dance moves.For the grand finale, Clements spun around on her head as her students broke out in cheers and applause.