I always enjoy realizing I am dreaming or even half realizing it in the middle of a dream and rewinding it whenever I don't like how things are turning out. Or better yet, sometimes I will transform certain aspects of a dream to make me happier.  For instance, sometimes there will be an evil person in my dream, and I'll just transform him/her into having been a hot girl that suddenly gave up on being evil and just wants to be with me. Right now. Dreams are fun :)