Show the total number of keywords of the movie "I Hope They Serve Beer in Hell".
"I Hope They Serve Beer in Hell" refers to title = 'I Hope They Serve Beer in Hell';
SELECT COUNT(T2.keyword_id) FROM movie AS T1 INNER JOIN movie_keywords AS T2 ON T1.movie_id = T2.movie_id WHERE T1.title = 'I Hope They Serve Beer in Hell'