What was he thinking??

The "What was he Thinking" award for this week goes to one of my classmates for the following question (during a seminar on body fluids and sodium loss)...

"So if you were stuck on a desert island, would it be better to drink your own urine, or make a seawater enema?"

(In case you were wondering, they are both bad ideas... and how exactly you would make a seawater enema while stranded on said desert island is certainly beyond me.)