Broken Mario Anomaly

The Distorted Mario Anomaly, also known as the Broken Mario Anomaly, is an anomaly appearing in personalized copies of Super Mario 64. Unlike many other anomalies, the Broken Mario Anomaly seems to occur at random, but the anomaly usually has the potential to be manifested by the Personalization AI when the cartridge is damaged, subjected to the technique known as cartridge tilting, or the transfer of data being tampered with. The anomaly causes the player to lose control of Mario in many ways.

Unused AI Remnants
It is theorized to be the behavior of an unused enemy/boss due to it`s random movements and manipulation of Mario's model to possibly to fit a different, smaller rig than Mario's. Distorted Mario can interact with objects like the Wing Cap and Metal Cap. However, this probably isn't a capability of its original form.