Movie trailers often use false advertising techniques to misrepresent films and increase viewership. Scenes shown in trailers are sometimes not actually in the movie, different genres are claimed, and only "funny" or exciting bits are highlighted. For example, the National Treasure sequel trailers contained numerous shots that did not appear in the film at all. More recently, low-budget thrillers have been marketed as horror movies, a more profitable genre. Films like Mother! and It Comes at Night underperformed financially despite positive reviews, possibly due to misleading trailers that misled audiences. While false advertising is generally unethical, it is difficult to advertise complex films without risk of spoiling the movie.