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what is this component? Answered

I opened up this toy (Homer Simpson Talking Eight Ball) to circuit bend it, and found something odd. The  board has a strange-looking brass (?) ball soldered to it. It's attached to the board with three prongs and is soldered to the board at one point, soldered to the wire for the play button. It is labeled S1.

Discussions

 
Does the 8-ball power up automatically when you pick it up?
If so, the component is a vibration switch.  There's a moving part inside the dome which makes contact with the outside when the ball is moved.

It does sometimes activate with shaking, that makes a lot of sense. Thanks!