Why carve a pumpkin when you can smash it? The national phenomena of Punkin’ Chunkin’ is back this weekend for its fourth local squash-smashing event. Allegheny County Parks is teaming up with SHARP Robotics on a full-sized, traditional catapult to propel pumpkins through the air and over the grounds at the Hartwood Acres Park Amphitheater. The goal? Launch a pumpkin as far as you can.