Roommates

Rory was not tidy and would  leave out dishes and food and other things around the apartment. Rory didn't mind a bit of a mess. The apartment was just going to get messy again later, so why worry about it.

Rory's roommate Bert, on the other hand, was a bit more of a stickler for tidiness. Bert had already had to ask one roommate to move out and had hoped that wouldn't have to happen again...

Mashed Potatoes

Blaine was in charge of making the mashed potatoes while at home for the break. It seemed symbolic in a way - mashing the potatoes and transforming them. They still maintained many potato qualities, but they were different. This was much like Blaine's experience with the graduate program. Transformed, but maintaining some qualities. Also Blaine felt like the past semester was one long experience of being beaten by a hand mixer.

"Maybe I won't be mashed potatoes as a result of this semester," thought Blaine. "Maybe I'll just be a couch potato for a while." Blaine laughed really hard at the joke. 

Blaine wasn't really that great at jokes. That was why they didn't say jokes out loud very often.

Demon

The students wouldn't go so far as to say that the professor was some sort of demon. Mainly because the professor had such good hearing and they would get in trouble.

Tired

Sometimes students get to the point that they just have to say, "I can't even."

I guess if you have that's short for, "I can't even finish this sentence in a way that would make it a complete sentence and not a fragment." In which case, they should go take a nap and drink some vitamin C and come back and we can finish the conversation.