Why do Late Night hosts sit on the right?

The most popular and long-running chat show in Ireland has the presenter on the left and the guest(s) on the right, as does the less popular Saturday Night show.

Well, of course. Water swirls the other way down under, too.

Another prominent exception was the Larry King Show.

And on The Tonight Show, guests are seated at the left but enter stage from the right.

I think Andrew Denton did as well. And, going back a way, Michael Parkinson in the UK.