Double-goers

One of my colleagues really makes me laugh.

It is hard to describe, but he's always one step ahead.

I go to him with something that I think will make him laugh, and before I know it he's making me laugh.

 It's almost as if he's out to get me.

To another colleague however, I seem to be able to do something similar. It's not about me being funny particularly, but I seem to press his button without really thinking about it.

It's all great.

You'll know what doppelgängers are, people who look so alike you that people mistake them for you.

There aren't many in the world, perhaps only one per person. Mine lives in Hollesley - amazing that he lives so close.

 Wikipedia says that they are thought to bring badness if you see yours. I'm curious because the translation of the word into English is 'double-goer', which is a perfect word for describing the one person who makes us laugh before we can make them laugh - consistently.