Find the titles of items that received both a rating higher than 8 and a rating below 5.
select t1.title from item as t1 join review as t2 on t1.i_id = t2.i_id where t2.rating > 8 intersect select t1.title from item as t1 join review as t2 on t1.i_id = t2.i_id where t2.rating < 5