I think Beckett was influenced by those clowns, Buster Keaton, Abbott and Costello ... by that sort of physical comedy. I don't think it was an accident that they had Buster Keaton in his film.
I've been a huge fan of his since I started directing. For me, directing Beckett has the same rush I had when I was directing Shakespeare. It is sublime material, and when it works it is so powerful. It's some of the most exciting theater I've ever been part of.
I may differ from other Beckett directors, but I do think there is an emotional life to the characters. I know that Beckett and a lot of Beckett actors feel that they must be very flat and far more technical; I personally encourage actors to invest.