You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: POP MUSIC 
Clue: Elvis Presley record which held Billboard #1 singles position for 11 weeks, longest in rock era
\"hound dog\"/\"don\'t be cruel\"

Category: THE MOVIES 
Clue: This 2003 film spawned a craze for clown fish in home aquariums
finding nemo

Category: 20th CENTURY FIRSTS 
Clue: On Oct. 14, 1947 in the Mojave Desert the first of these sounds was made by man; it was the byproduct of another first

sonic boom