You jump twice as high as normal when not wearing any armor.
You can now opt to knock out instead of kill unaware targets when making a sneak attack.
Putting on certain clothes makes certain factions friendly towards you.
Raiders = Raider Armor
Enclave = Enclave Armor or Power Armor
This Perk unlocks the "Vault Dweller" Missions: use the Vault Automated Neo-Cortical Instant Memory Upload System (V.A.N.I.M.U.S.) to meet your distant ancestors, the Vault Dweller (Fallout 1) and Chosen One (Fallout 2).
(the reward for completing these missions grants you ridiculous bonuses as a result of being synchronized with two great heroes of yesteryear)
Critical Hits may cause your opponents to explode. Watch that splash damage!
Neon Genesis Evangelion:
"My Suit's All Wet..."
Power Armor no longer negatively impacts your SPECIALs.
"The Last Free Man"
While wearing the "Distinct Glasses" and the "HEV Power Armor," you gain +100 HP.
Gears of War:
"Chest High Walls"
Enemies attempting to shoot you while you are crouching take a 25% penalty to hit.
"Right Hero, Wrong Apocalypse"
The good news? You gain a +10 bonus to your Endurance and Charisma. The bad? Raiders attack you twice as frequently.
Glowing mushrooms are scattered around the Wasteland. Eating them causes you to grow to the size of a Super Mutant, gaining +10 Strength and +200 pound carrying capacity. But never you drop below 50% health, you go back to normal. Heal up and find more mushrooms!
You can carry and shoot two one-handed firearms at once, but your Charisma is drops by 5 (minimum 1).
Grand Theft Auto:
"Wasteland Drive By"
The splash damage caused by blowing up cars is tripled. Watch out!
Prince of Persia
If killed, the game rewinds to 10 seconds before you died.
"Judge, Jury, Punishment"
You can equip and fire two two-handed small arms.
"That's a Nice Jacket..."
Wearing the Bullet-Riddled Trench Coat grants you a +10 damage bonus with every weapon, immunity to being crippled, and immunity to critical hits. It also makes you permanently addicted to beer and whiskey.
"You Suck, Lady"
Sandman Kills now restore your health. (Black Widow Feat required)
God of War:
"God of Flailing"
You can now equip and attack with two one-handed melee weapons.
Isaac Clarke (Dead Space):
"Cut Off Their Limbs!"
Limb shots instantly cripple your opponent.