When twelve fingers are an advantage:

[Baitball Blogger]

(1) When you have to place 1000 cupcakes on the display before the clock runs out on CupCake Wars.

(2) Unloading the groceries, because you have more fingers to hook the handles of the grocery bags.

(3) Shampooing the dog.

(4) Licking icing off your fingers.

[HopeHoops]

1. (ahem) hand jobs.

[Major Nikon]

3. 20% markup

[Major Nikon]

2. You're a baker

[Baitball Blogger]

4. No, Not a baker.

Just addicted to Cupcake Wars.

[MiddleFingerMom]

5. These are perhaps the coolest convenience invention ever (along with the rubber-tipped...

.
.
.
... plastic tweezers that only pick up ONE coffee filter at a time). Five bucks or less.
.
.
.
http://www.ohgizmo.com/2012/05/01/one-trip-grip-grocery-bag-holder-will-save-your-fingers/
.
.
.

[Baitball Blogger]

6. Very, very good.

Except they will end up in the same place as my recyclable bags.

[ThoughtCriminal]

7. Piano

"Impromptu for 12 fingers"

Irene: It's amazing, isn't it?
Vincent: Twelve fingers or one, it's how you play
Irene: That piece can only be played with twelve.

[Incitatus]

8. popping bubblewrap, erotic massages