  A novel and simple superbunching pseudothermal light source is introduced
based on common instruments such as laser, lens, pinhole and groundglass.
$g^{(2)}(0)=3.66 \pm 0.02$ is observed in the suggested scheme by employing two
rotating groundglass. Quantum and classical theories are employed to interpret
the observed superbunching effect. It is predicted that $g^{(2)}(0)$ can reach
$2^N$ if $N$ rotating groundglass were employed. These results are helpful to
understand the physics of superbunching. The proposed superbunching
pseudothermal light may serve as a new type of light to study the second- and
higher-order coherence of light and have potential application in improving the
visibility of thermal light ghost imaging.
