A 2002 British-Irish docudrama film written and directed by Paul Greengrass. It portrays the 1972 Bloody Sunday massacre in Derry, Northern Ireland.
Black Sunday.
""Matthew McConaughey mentions Paul Greengrass, the director of his upcoming film, and lists 'Black Sunday' as one of Greengrass's notable works. Given Greengrass's filmography, it's highly probable he meant 'Bloody Sunday,' a docudrama he directed, rather than the 1977 'Black Sunday' by a different director."