Back at the Barnyard (2007)

Season 2: Episode 30

After Freddy gets struck by lightning, he becomes a genius and knows everything, so they get him to compete in a trivia show so they can win a million dollars. They realize that, unfortunately, Freddy's intelligence is only temporary and he becomes stupid again after a prolonged period of time. So the animals make an electrical system to make Freddy smart with each shock. But the problem is, every time a question is announced, he keeps getting dumb again and again. Frustrated that he keeps getting dumb, Freddy goes backstage and shocks himself at high velocity and dreams that he meets with Albert Einstein who gives him the answer to the final question which is actually incorrect so Freddy curses Albert Einstein for making him lose.