The static-o-matic electric hair chair was a chair invented by Emmett Brown. The chair sent 200,000 volts of static electricity through a customer's hair, thus raising the hair and making it easier for barbers to cut.
Doc Brown also stated that the machine could not damage your hair. He once insisted that it was impossible because he had been using it for years.
In 1958, George McFly's newfound confidence was giving him a big ego, and he was ignoring his fiance Lorraine Baines. They set a wedding day for 1960, but Lorraine wasn't sure that their romance would last. She came to Doc's mansion, looking for Calvin Marty Klein, so Doc claimed that he had gone off to college.
So, instead, George and Lorraine sought the advice of Marty's "uncle", Doc Brown. He had planned to use his newest invention, a tiny radio receiver to tell George what to say to Lorraine, like Cyrano de Bergerac. However, Doc's plan is foiled by the fact that Lorraine was outside, and she heard Doc talking to someone.
George went out to talk to Lorraine, and George became jealous. Doc's dog Copernicus tripped George while he was trying to protect Doc, and George fell into the static-o-matic electric hair chair. George and Lorraine had a look at George's statically spiked hair, causing them both to laugh, and for George to realize that he needs to not let his confidence get to his head, and to relax and be himself.