Graham Norton has that special quality a select few talk show hosts possess- the ability to chat up celebrities and get them to tell him damn near anything.
This special quality is what makes The Graham Norton Show so fun to watch, well, that and Graham's naturally witty charm, which ties in to the whole "people tell him everything" thing.
But sometimes the stuff people share on his show is so shocking and outrageous that even Graham is left at a loss for words, which is no small feat! (NSFW due to language)
-Via Laughing Squid