Did Principal Skinner make a mistake when he offered his prized student a ride on a submarine. "Yellow Subterfuge" is the seventh episode of the show's 25th season.
Added:
A picture of Principal W. Seymour Skinner in all his glory saluting. Poor skinner is a vietnam vet and tries so hard to be a good man, but succumbs to the will of his mother and Bart Simpson.
Added:

The Simpsons Quotes

Lincoln, Lincoln. I've been thinkin'. What the hell have you've been drinkin'? Is it water? Is it wine? Oh, my gosh. It's turpentine!

Bart & Lisa

Yep, here's your problem. Someone set this thing to "Evil."

Repairman