which is either a very high bar or the beginning of a very f

which is either a very high bar or the beginning of a very funny joke.
这是在obama在西敏寺演讲.
全句是：I have known few greater honors than the opportunity to address the Mother of Parliaments at Westminster Hall.I am told that the last three speakers here have been the Pope,Her Majesty the Queen,and Nelson Mandela -- which is either a very high bar or the beginning of a very funny joke.