There's a great program available on youtube - I, Claudius A Television Epic which gives behind the scenes interviews - many years after I, Claudius was made - about that incredible classic series. It's hard to believe it was produced in the 1970s.
There is so much good stuff in the series, but all the bits with Derek Jacobi as Claudius and John Hurt as Caligula are absolute genius - as the clip below demonstrates.
More from genius John Hurt - including Caligula's wacky transvestite dance!