The Echo Tunnel

I waddled down the hallway and bumped my knee right into a stiff brown cardboard tube lying across the rug. Grrr! A hollow cardboard serpent daring to challenge my evening patrol! I dropped onto my knees, planted my face right against the open rim, and let loose a thunderous monster roar. *HOOO-OOOM!* My growl rumbled through the inside and echoed out the far end like a giant beast trapped in a cavern! A sudden snicker burst straight from my belly. Leaning all my weight forward, I shoved the tube with both hands and sent it rumbling down the runner like a runaway steamroller.