You might find his eye-opening programmes on physics and astronomy extremely interesting, but you still might be hesistant about approaching him after a lecture to sing to him. Steve Marsden wasn't.

According to the description of this video, he "broke into" a conference to sing to a very, very, uncomfortable Brian Cox (who event at one stage literally attempts to run away).

So would anyone, if you were approached by a guitar-weilding man who wants to "be best friends" with you, "braid your hair", and suggests having "a little fight in our underwear".