Piano or Guitar???

I was thinking last night which of these instruments I would rather be able to play. At first I thought it would definitely be guitar, so I could badly parody my favourite musicians. ( Jason Mraz and Speechwriters LLC, how I love thee! ) But then I thought about it a little deeper and settled on the piano. I was thinking it would just be the best thing in the world to walk into a smoky bar, order a whisky, sit at the piano and start banging out some good old fashioned rock and roll. Maybe tuning it down a bit with some Sammy Davis Junior, slipping in a bit of Savoy Brown and then gently ending on the Blues. Man, real life will just never compare to the cool stuff I wish I could do.