Family guy has occasionally had marijuana themed jokes in their arsenal, but their April 19th episode launches them into the currently non-existent Marijuana hall of fame. It can be assumed that the show decided to honor 4-20, April 20th. Actually no assumption is necessary because the episode is titled "420". If you haven't scene the video below won't spoil it for you, but it will allow you to experience the fun of marijuana legalization viewed through a filter of cartoonish surrealism and sarcasm.
To watch the full "420" episode click here.