Vault-Tec Bobblehead

The Vault Boy bobblehead figures were promotional Vault-Tec items. After the Great War, they can mostly be found in Vault-Tec Vaults.

In Fallout 3, each of these bobbleheads permanently increases one of the 7 statistics or one of the 13 skills of the Player Character. Two of the Fallout 3 achievements are about collecting 10 or 20 of them.

The bobbleheads which raise SPECIAL scores will not increase a statistic over the normal maximum of 10. If your score in the relevant SPECIAL statistic is already 10, the extra point will be wasted.

Stats
will increase S.P.E.C.I.A.L stat by 1 point.
 * Strength - Megaton - Lucas Simms' House. On desk in the second most bedroom on the second floor.
 * Perception - Republic of Dave - Museum of Dave
 * Endurance - Deathclaw Sanctuary - Deathclaw Sanctuary Entrance
 * Charisma - Vault 108 - Cloning Lab
 * Intelligence - Rivet City - Science Lab. On one of the desks in the center of the lab.
 * Agility - Greener Pastures Disposal - Office
 * Luck - Arlington Cemetery North - Arlington House

Skills
will increase skill stat by 10 points.
 * Barter - Evergreen Mills - Market Bazaar - In a dark cave-nook, in the corner of the room to the right of Smiling Jack (trader). Jump over the work bench, it's on the right-most shelves.
 * Big Guns - Fort Constantine - CO Quarters
 * Energy Weapons - Raven Rock - Sector 2B
 * Explosives - WKML Broadcast Station - Sealed Cistern
 * Lockpick - Bethesda Ruins - Bethesda Offices East on a desk with an active lamp.
 * Medicine - Vault 101 - Dad's desk. It can be obtained before you take your G.O.A.T., during your escape from the vault or during your brief (optional) return to Vault 101.
 * Melee Weapons - Dunwich Building - Virulent Underchamber
 * Repair - Arefu - Evan King's House
 * Science - Vault 106 - Living Quarters
 * Small Guns - National Guard Depot - National Guard Armory: sitting on a shelf in the sealed storage room in the basement.
 * Sneak - Yao Guai Tunnels - Yao Guai Den
 * Speech - Paradise Falls - Eulogy's pad
 * Unarmed - Rockopolis

Behind the scenes
The bobbleheads were also used as a Fallout 3 promotional item by Bethesda Softworks and are included in the Collector's Edition of the game.

See: Fallout 3 promotional items.