Sometimes a feed is ordered, but it's not easily sortable. Turner Classic Movies (TCM) has an RSS feed of the movies showing on their channel over the next 24 hours. The feed is ordered chronologically, starting with the film currently showing. But there's no attribute, like pubDate, that would let you list the movies in reverse-chronological order using the Sort module.
Pipe Web Address: http://pipes.yahoo.com/pipes_team/_E_4K_FS3BGdIMQbLe2fWQ