In the barbeque finale scene of Fast 9, we see a chair at the family table that’s left intentionally empty. That seat is still reserved for Brian (Paul Walker, RIP.) Well, the Knights of the Round Table may not have had cars, but they did have family.  

In Arthurian legend, the Siege Perilous is an empty seat at the Round Table reserved by Merlin for the knight who would successfully find the Holy Grail. In Thomas Malory's book "Le Morte d'Arthur," Sir Galahad takes the seat on Whitsunday, but it is said to be fatal for anyone unworthy who sits in it. (For context, it would be like if Hobbs or Shaw took Brian’s seat.) Some scholars believe the “perilous seat” is a half-remembered Celtic ritual similar to the Irish Lia Fáil.