Yes, the "Sombrero Incident". A very heavy hat was built for Señor Snuffalupago, a relative of Snuffy's I was playing. Midway through a scene, the aluminum frame backpack I wear to support the beast gave way, dropping the entire character and puppeteers in a great heap. Luckily, no one was hurt. Within about twenty minutes, the shop had drilled and riveted the broken section allowing us to finish the show. When they had a proper amount of time, the Henson shop replaced the stressed backpack. Snuffy himself, twenty-five years later, is the same. Of course he gets maintained inside and out before each season, with special attention paid to all those lovely feathers worked in to his fur. After the sombrero incident, all hats and costume pieces were made much lighter.