I just stumbled on Uday Subbarayan’s Weblog and thought :0xCAFEBABE? Never heard of it.

So I did some googling :

The first four bytes of every Java class file are specified to be 0xCAFEBABE, a magic number that can help tools quickly differentiate likely class files from non class files.[more]

Voila, I do learn something new everyday. :)