So my office is in a listed building and as such it's a bit old and rickety. When people walk past my desk the floor shakes and my chair kind of vibrates/almost bounces up and down. I've grown completely accustomed to this.
BUT a new guy has just started sitting opposite me, and he seems to shake his leg/tap his foot rapidly all the time!!! So I'm vibrating as I'm typing this. What's the best way to tell him to stop being such a nervous twitchy fucker?