Definition: In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.
Input: Article: People faint when the normal blood supply to the brain is suddenly cut down. This can happen if they are surprised or shocked by sudden news or by something they see suddenly. Some people faint if they see others hurt .Some people faint in crowds. Others faint if they are in a room that is hot and stuffy. If a person faints while standing, lay him down. If his face is pale, lift his feet .If he is sitting down when he faints, place his head between his knees, loosen any tight clothing that might keep him from breathing easily .If possible, place a wet cloth on his forehead. 
 Answer: see something unexpected

People may faint if they  _  .