Goosebumps Ghost Camp Book 45

Harry and his brother, Alex, are dying to fit in at camp Spirit Moon but the camp has so many weird traditions. Like the goofy camp salute and the way the old campers love to play jokes on new campers. Then the jokes start to get serious, creepy and really scary. First a girl sticks her arm in the campfire. Then a boy jams a pole through his foot. Still they're just jokes, right?