So when I was in undergrad, the grad student TAing for my intro level English course that was mandatory for the major refused to use proper grammar 90% of the time. All my papers were covered in notes void of capitalization and punctuation, and they ran on for miles. I want to believe he was just high or drunk or something when correcting papers, but he wasn't entirely coherent and on topic during sections. So maybe he was intoxicated all the time?