1994 - 2001 | 10 seasons | 236 episodes Love it or hate it, there probably aren't any other sitcoms that left such a huge cultural impact as Friends. From giving us 'The Rachel' - a haircut inspired by Aniston's hairstyle and wanted by millions of girls worldwide, to expanding the vocabulary of Western English slang and helping people learn the English language. Seriously, though, a 2012 poll by Kaplan International English Colleges revealed that 26% of students cited Friends as the best show to improve English. And what better way to improve your language skills than by watching probably the best comedy cast of all time?