While the best man's required duties are only those of a friend, in the context of an American/British white wedding, the best man will typically:
* assist the groom on the wedding day,
* keep the wedding rings safe until needed during the ceremony,
* act as a legal witness to the marriage, and
* make a toast to the bride and groom at the reception.
****s sake such a responsibility
Probably end up losing the rings, forgetting my speech and chucking my drink everywhere when I try and make a toast