please at least say hi to the people cleaning up after you where ever you are (janitors, dorm crew, etc.)…a “thank you” every now and then would be nice too…they gotta literally deal with your garbage on a daily basis so it’s the least you could do
I cannot stress this enough. You would not believe how many people didn’t know how to respond when I said thank you. That scares me because that shows how little acknowledgement and thanks they get on the job.