Donnie, it also depends on your range. I used to flip people out by playing Bowie (Ziggy Stardust, Space Oddity, Moonage Daydream) or unexpected solo Beatles (A Day In the Life, I'm So Tired) or Lou Reed (Satellite of Love) or funny things like Loudon Wainwright III's Dead Skunk... There are so many things you can choose, but only if you can pull them off and they suit your vocal and playing range.