It's No Picnic Being Teen Wolf

Scott has to watch over Grandpa for the weekend while Grandma is out of town, but it's the same weekend as the school picnic. Grandpa tags along with Scott and his friends, leaving Scott embarrassed in spite of Grandpa being able to keep up with the other teens. During a three legged race, Scott wolfs out and flees, leaving it up to Grandpa to find him.