Suddenly in the middle of a number he jumps up, his hands clasped in front of him, and walks around the piano stool, and then, unexpectedly, out booms a vocal break in a bass voice from somewhere.
Suddenly, mid-performance, he jumps to his feet, holding his hands out in front of him as he walks around the piano stool. Then, unexpectedly, a booming bass voice breaks through the music from an unknown source.