I had a similar situation as a grad student in a wet lab. I was in classes most of the day and was forced to work in the lab during the morning and evening. As

I had a similar situation as a grad student in a wet lab. I was in classes most of the day and was forced to work in the lab during the morning and evening. As the PI was in from ~10am to ~4pm, they never saw me at work, and assumed that I was doing no work. Despite that PI lecturing in some of my classes. Fortunately, I was in a rotation for that PI and was able to leave the lab easily. I still cannot for the life of me understand what they were thinking. How can you be so smart to get the position and not think past your own nose?