Courier: The Typewriter Font.
I was going to do comic sans this week for the laugh but this font was too good to skip for novelties sake. This font was released by IBM with their Selectric Typewriters, the first electric typewriter that used a 'golf ball' (swipe for a picture) to punch the letters instead of individual mechanical arms for each letter. You could also swap out these balls and buy one for a different font which is pretty cool. This also got rid of the need for the page to move across the carriage, big steps forward in the technology of typewriters for the time. It was design in 1955 by Howard Bud Kettler and then redesigned for IBM by our man Adrian Frutiger (who designed Avenir, the first font Friday post I did). IBM deliberately chose not to secure legal exclusivity to the typeface and it soon became a standard font used throughout the typewriter industry. Because they chose not to seek any copyright, trademark, or design patent protection, the Courier typeface cannot be trademarked or copyrighted and is completely royalty free.
Somthing unique to this font is that a lot of the Courier fonts are very thin. This is because it was to be used on a typewriter. When typed, the ink would bleed into the paper making it thicker that the actual die that typed it.People find it strange that its so think but this think font was never meant to be used digitally as you obviously don't get any bleed, the letters remain very thin. There are versions of Courier that have been updated to be used digitally and are made heavier to more closely resemble the font as it would have looked on paper rather than on the die.
Because screenplay format developed in the typewriter era, they were all written in this font and to this day it is standard to have the scrips written in this font. Had computers been around when screenplays were taking off this would not be the case. Now days the font is very popular in coding as it's a monospaced typeface. This means that all letters take up the same width, be it the letter i or a capital M, they will take up the same width. (More in comments)