Alright - I need help with interfaces.

Not sure I get how they benefit me. Please don't respond with MSDN, been there done that. Can't seem to get my hands around the concept for some reason... I am past reading, I need a working example. Sometimes I get things better when I walk the code.

Anyone got a simple example they could share? Trying to see how to create and implement an interface as well as why you would want to use an interface.