Happiness Is Dick Van Dyke Singing Along With a Mary Poppins Flash Mob for His 90th Birthday

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Have you ever seen anyone as happy as Dick Van Dyke singing along with a Mary Poppins flash mob? Have you ever been that happy? "I am very grateful that at 90 years old, I can still go out and play!!" the actor wrote on Twitter about the event, because he is a national treasure.