What part of "The Pit and the Pendulum" did you find most suspenseful? Why?

The
part of that I always find the most suspenseful is the part about the
pendulum. It starts with the narrator noticing that the painting of Time on the ceiling had a
pendulum instead of scythe, and then, although he is not sure, he thinks he sees the pendulum
moving. At that point, the pendulum is barely moving, which makes the narrator lose interest and
start to look around. Later, the narrator...