weird quarter

Hello friends. Im new to this site. I have a a strange looking quarter that I came across some time ago. Its from 1982. I don't know much about coins so any insight would be helpful. Thanks in advance.

 

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The coin took an acid bath. The acid ate away the softer copper core faster than the harder copper/nickel clad layers. There are plenty of other threads with similar coins on CoinTalk.

 

Thanks

 

Here's an older thread with the same damage:

http://www.cointalk.com/t195608/

 

My quarter sounds like silver. Feels lighter too. Why would someone do this to a quarter? Any clue?

 

People like to experiment, especially kids.