In a world with a 24-hour news cycle and the ability to update followers in 140 characters every few seconds, is there such a thing as "too soon?" Saturday Night Live might test the limits of those archaic words this weekend when one of its most-uproarious veterans, Maya Rudolph, hosts the venerable show. Rumor has it that SNL writers and producers are considering writing a sketch around one of Maya's most well-known celebrity impersonations, Whitney Houston.