American phrase "I know it's a little out of left field"

[PeaceMaker]

Hi guys,

can you please help me with this American phrase? What does it mean exactly when someone say "I know it's a little out of left field, but I wanna do it"...eg. I heard this phrase in the episode of Desperate Housewives, where Tom Scavo, middle aged guy, decided to be a student again...He said to his surprised wife: I know it's a little out of left field, but walking across the school quad, I felt so alive....

thank you guys in advance

PM

[Honey2]

I donnot know
I hope that someone helps you
_________________
live quite life

[Jamie (K)]

"Out of left field" means that something came from a place where you didn't expect it and don't usually look. The expression comes from baseball.

[Honey2]

[Jamie (K)]

No, a baseball that flies at you from a place where you haven't noticed, usually the left side of the outfield.
http://en.wikipedia.org/wiki/Baseball_field

[Honey2]

thanks
_________________
live quite life

[PeaceMaker]

I also thank you, Jamie.
Many thanks for the perfect explanation!
That phrase is clear to me now.