My first vivid memory of playing the part of a game show host comes from when I was about 5 or 6. High Rollers was on at the time, so we had the idea that I'd "be" Wink Martindale, and Mom and Dad would be my contestants. I had 9 square wooden building blocks on which Mom had written the digits 1 through 9, and I'd set up for each round by arranging them randomly in a square on the end of our coffee table. As for questions, I had a little electronic toy with a bunch of multiple-choice question cards (written for kindergartners, mind you). I'd ask them the questions, and a right answer earned control of the dice. It was fun.
Also, in 1999, my junior year of high school, I took Spanish III with a bunch of kids who were taking Spanish II. When it came time to review for a test, our teacher, being a nice woman and knowing I knew the material better than the younger students, would let me host various game show-inspired games, such as Jeopardy!, Tic Tac Dough, Wheel of Fortune, even The Joker's Wild (I used three dice instead of a slot machine, and 6's were wild). I'd make up questions on the spot based on the categories needed, and a good time was had by all.