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what is this component?

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.

Picture of what is this component?
AndyGadget5 years ago
 
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.
noahh (author)  AndyGadget5 years ago
It does sometimes activate with shaking, that makes a lot of sense. Thanks!