Metch... the big bump. Minds me of the time I was in Springhill, Nova Scotia so many years ago on a history field trip in High School. We went underground and an elderly miner was telling us that coal "bumps" and noises were regular and welcome.... it was when it grew silent that the miners got nervous.... of course, his voice trailed off and we were left to listen to absolutely nothing but our own fears and heartbeats. At that moment, I picked up a large lump of coal and flung it upside a large wooden coal bin. Beth Rothwell screamed, pissed her pants and ran back up the ramp, along with several others. I had to admit to the prank before the teacher would continue our trip and I spent a great deal of time writing "The Mining History of the Maritimes" as punishment. It was worth it.