Well, let's break this down:

Thumb--Doing anything without your thumb is a damn struggle. Opposable thumbs are awesome.
Index finger--I point at things a lot and I use touchscreen phones and the touchscreen menu at Wawa.
Middle finger--I use this a lot for driving.
Ring finger--I guess if I get married someday! Although I don't use it much on my right hand, but I write right handed.
Pinky--They're just smurfing awesome?

I guess I'd have to go with the pinky on my left hand.