Patrick Muldoon showed off his humor and energy in the last video he ever sent his sister ... even pulling out his old high school chant in the heartbreaking clip. The actor's sister, Shana Muldoon Zappa , shared the video to Instagram late Wednesday night ... revealing her brother sent it on Saturday during a preview opening of the new Los Angeles County Museum of Art. Check out the clip ... Muldoon excitedly films a painting of St. Ignatius of Loyola -- before breaking out into a chant. Zappa

Tag-uri: Instagram