when I was in sixth grade we had this critical thinking class with this one lady halfway through the year. we took the first week or so doing getting-to-know-you activities. a few days right after she disappeared. she never came back. not to the class, not to the school, no explanation. we got this awesome long-term sub who just talked and talked (mostly about her daily rounds to Disneyland) and watched movies and YouTube the whole time too. never critically thinked about anything.