Summer I started yesterday. All I can say is, "Oy vey."
Summer classes are perceived as being a wee bit easier. However, you're working on a compressed (seven-week) schedule, and the traditional amount of material still has to be covered. It can make for a hellacious schedule.
Add in a handful of students who have issues ranging from childcare -- "I don't have a sitter -- can I bring my three-year-old?" -- to "I planned three vacations and will miss four out of our seven classes; I can pass, right?" and I clearly need to lay in more headache powders.
Also, looking out over a sea of vacant faces, I have two students who, I am fairly certain, are either drinking during class, or arrived drunk.