Worst. Doctor. Ever

 is an unmarked Fallout 3 quest.

If you ask Sawbones in the Citadel to heal you he will wound you instead. With a high enough Science or the Robotics Expert perk you can fix Sawbones and receive free healing. Sawbones will not be particularly happy about it though.

This robot and Andy back in Vault 101 both prove that it seems the Mister Handy and Mister Gutsy model robots have some good fun saw tendencies when assigned the role of doctor.

Rewards

 * Free healing at the Citadel.
 * After repairing Sawbones' malfunction and receiving medical treatment, an effect called "Sawbones Precision" will appear in your Pip-Boy, giving you +2 END and +2 PER. The effect lasts for about three hours, and it can be gained again by receiving healing from Sawbones.

Bugs

 * You are unable to speak to him after escaping from Raven Rock, unless Broken Steel is downloaded on the XBox 360. This does not occour on the PS3 (needs confirmation for PC version) [You can still do this unmarked quest even after Raven Rock on PC, furhtermore, even after "Take it Back!" and your awakening in the Citadel once into Broken Steel content].