You land on a set of sharp iron spikes! More

While this armour was effective against cuts or blows, their weak points could be exploited by long tapered swords or other weapons designed for the purpose, such as pollaxes and halberds.

Many of the animators have trouble drawing Bart's spikes evenly one trick they use is to draw one on the right, one on the left, one in the middle, then continue to add one in the middle of the blank space until there are nine.