From the Treasure Trove: Gertie the Dinosaur

Gertie the Dinosaur is a 1914 animated short film by American cartoonist and animator Winsor McCay. It is the earliest animated film to feature a dinosaur. McCay first used the film before live audiences as an interactive part.
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As the film started Gertie poked her head out of a cave, and McCay encouraged her to come forward. He reinforced the illusion with tricks such as tossing a cardboard apple at the screen, at which point he turned his back to the audience and pocketed the apple as it appeared in the film for Gertie to eat.