Tennis Anyone?
Watch this video of two people playing an early video game called "Tennis for Two." See if you can guess the year this happened:
From the movie you can probably tell that this game is being run on an analog computer and that its being displayed on the vector display system of an oscilliscope. This game was part of an educational display. Below is a picture of the entire display with the oscilliscope pointed out.

So was this 1949, 1958, 1963, or 1967?
Drum Roll please...
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This game was built in 1958. Although there are other contenders, many consider this the first video game ever.