Who is this guy beside Bill Gates? What funny thing did he say to him?

[JohnsonBox]

More context: @billgates

[John S. Veteran]

Stephen Colbert, a political satirist from the Comedy Channel

[Luc2k]

He does this to tons of people or things.

[Teebor]

The bits of his show I've seen are hilarious, sadly I've not seen it in the UK so it might need to be acquired through a different method :)

[Luc2k]

The bits of his show I've seen are hilarious, sadly I've not seen it in the UK so it might need to be acquired through a different method :)

You can watch on the official site, although I usually go for the "different method" for convenience.