Mister Rogers' Neighborhood (1968)

S02E38 Opening the wizard’s box

Dr. Bill and Elsie Jean Platypus, along with their friends, are intrigued by the mysterious chest left behind by the Wizard of Lupovich. As the neighbors come together, the chest magically opens, unveiling a whimsical bunny hat. Those who wear it find themselves irresistibly bouncing around in delight.