Graduation day at P.U. finds Buster Keaton's character graduating with a degree in botany. He is seated next to a girl graduating with a degree in cosmetology and a man with a degree in electrical engineering. The dean (Big Joe Roberts) asks for someone to take on the job of wiring his house for electricity while he is away on vacation. Just prior to this the diplomas get scrambled and Keaton winds up with the engineering one. Thus, the job winds up going to him. The dean drives away from his home with Keaton sitting at the curb diligently reading "Electricity Made Easy". When the dean returns Keaton has wired the house in only a way that Buster could devise making heavy use of automated trains - Keaton's favorite prop. The plot is complicated when the guy with the actual engineering degree shows up at the dean's house in search of revenge.
Buster always said that if he hadn't been a comedian he would have liked to have been an engineer, and shorts like this one show he had a real talent for both. Highly recommended.