Weird keyboard problems

[acf]

My keyboard has suddenly started doing weird things, such as the left shift button types an uppercase 'r', the 'r' key will only type as uppercase, and the right shift key takes me to the overlay screen with post-it notes and the calculator. Any ideas besides taking it to the mac store? And any idea on how much they typically charge to fix things like this? thanks in advance

 

[demulis]

Did you drop anything in your keyboard? It seams that some thing is connecting the Shift and R cables...

I think the best option is taking to the apple store, I have no guess about the price cuz I'm from Brazil