From Team Fortress Wiki
You are trying my patience!
— The Medic yelling at his henchmen
The Dr. Gogglestache is a miscellaneous item for the Medic. It is a pair of team-colored glowing goggles with flaps and a white moustache.
This item can only be worn around Halloween or during a Full Moon; at other times of the year, it does not appear in gameplay, unless the server has Halloween mode enabled. However, it can be equipped at any time and can still be viewed on the loadout screen even when it is not visible during games.
October 27, 2011 Patch (Very Scary Halloween Special)
- Dr. Gogglestache was added to the game.