Is it this one: "The Omen joke and Rodney's apparent fear of Damien became a running gag (accompanied, not, in fact, by Jerry Goldsmith's original music from the film in question, but by its invariable stand-in, the "O Fortuna" from Carl Orff's "Carmina Burana") " (I found this on the Wiki page about Fools & horses
http://en.wikipedia.o...nly_Fools_and_Horses)