Riding a roller coaster makes you happy is the perfect gift for roller coasters, amusement parks fans. It's a great gift idea for a birthday or Christmas. If you love riding roller coasters then you will love this. Funny Roller Coaster Grandma Definition. Are you a fan of amusement thrill, adrenalin, and adventure? This design is for anyone who loves steel or hybrid coasters and to wear on your next trip to your local theme park, circus, carnival, funfair, and the county fair. Lightweight, Classic fit, Double-needle sleeve and bottom hem