ALBAWABA - SNL's Colin Jost sparks controversy with Scarlett Johansson roast during Joke Swap. The hosts of Saturday Night Live's "Weekend Update" do a joke swap at the end of each year, in which they compose jokes for one another to read aloud on-air without ever seeing them. Naturally, they take advantage of this chance to make fun of one another, frequently exploiting their racial differences as shock value. Co-host ...