What's going on with my LED?

Can someone explain this to me?

I have no photoresistor or sensor of any kind connected to my arduino, but whenever I begin to move my hand towards my push button, my LED turns on and when I pull my hand away it turns back off. I'll let it sit for like 10 minutes making sure nothing changes, then the second I move my hand towards it the LED turns. I can inch my hand back and forth, it works perfectly as if it was designed to do this.

What the hell is going on?

Let me guess - a floating pin.

How is this an "Installation & troubleshooting" question?

AWOL:
Let me guess - a floating pin.

How is this an "Installation & troubleshooting" question?

I didn't know where else to ask this.

Feel free to fill us in with any details - board, code, schematic.