Ep 18. Mr. Egghead

In Full House season 3 episode 18, titled "Mr. Egghead," the Tanner family prepares for a science fair at school. D.J. is excited to win first place, but her hopes are dashed when she discovers that her dad's old college friend, Mr. Egghead, is also participating in the fair. Mr. Egghead, whose real name is Sam Peterson, is a science teacher at D.J.'s school and known for winning every science fair he enters.

Meanwhile, Jesse and Joey try to come up with a creative project for Michelle. They decide to build a volcano, but their attempts to make it erupt fail miserably. Eventually, they turn to Stephanie for help, and together they come up with a science experiment involving Mentos and soda.

At the science fair, D.J. and Mr. Egghead's projects are neck and neck in the judges' eyes, and both are given the chance to present their projects on live television. However, when Mr. Egghead's project fails during his live presentation, D.J. takes the lead and wins first place.

In the end, Mr. Egghead reveals to D.J. that he purposely let her win because he wanted to see how it felt to lose. He tells her that he was tired of always winning and that he wanted to feel the satisfaction of trying his best and doing his best. D.J. is touched by his honesty and tells him that winning isn't everything, but doing your best is what really matters.

Overall, "Mr. Egghead" is a heartwarming episode that teaches a valuable lesson about sportsmanship and doing your best, even if you don't win. It also shows the importance of creativity and teamwork, as Jesse, Joey, and Stephanie work together to come up with a unique science experiment. The episode's message is sure to resonate with both children and adults alike, making it a timeless and beloved installment in the Full House series.