The Netbook of Witches and Warlocks
By Timothy S. Brannan and The Netbook of Witches and Warlocks Team
Full netbook can be found on the followng website
This broom appears as any other magical or mundane broom. That is until a witch (no other class) attempts to ride it. The broom then takes off in any random direction at top speed as per a broom of flying. The only way to stop it is to cast a remove curse. If the witch riding attempts to cast she is under normal restrictions to cast while mounted plus an extra -2 to cast.