For years when watching 2 people present something I did what you're supposed to do and looked at the person speaking. However, I have discovered that it's much, much funnier if you spend all your time looking at the person who isn't talking. It's kind of awkward, like a comedy of manners.

Do you mean the expressions on their face and mannerisms while the other speaks?
I thought you were going to say you watch them with a trollface

Yup. It's far more interesting than watching the person who is speaking. Now when I watch it, I don't even see anyone's lips move during any of the links they do together. It's kind of a little bit weird and awkward, which is more fun than just blandly watching the person who's speaking.

I watch them with the sound off, much better

Omg I do this all the time! I also do it with Ant & Dec. Dec is funny to watch when he isn't speaking cos he seems to always be thinking of something humorous and trying not to laugh lol