Vince Lombardi coaching a team quarterbacked by Bart Starr. Has there ever been a better football team, ever? I didn't think so.
These are always fun discussions and involve a lot of subjective judgement when comparing teams from different eras, but I think a case can be made that the San Francisco 49ers of the 1980s were the greatest team of all time -- and the 1989 team in particular stood out above them all.