It was time to do the scene, and Cary said, “George, why don’t we just go ahead? If you don’t like it, we’ll do it again.” So, without a rehearsal or anything, we started the scene. As I was talking, it hit me that I’d had too much to drink. So, as I explained things to Cary, I hiccuped. In answer to the hiccup, Cary said — out of the clear blue sky — “Excuse me.” Well, I sort of said, “Ummm?” It was very difficult for me to keep a straight face, because his ad-libbed response had been so beautifully done … Cary had an almost perfect humor.
Jimmy Stewart on Cary Grant while filming ’The Philadelphia Story’