Easy. My dad bringing home an Intellivision Christmas Eve night around 1980/81 as a gift for my mom...lol. Crack of dawn the next day I'm up playing Poker & Blackjack and Armor Battle all day long, as it quickly became one of my best presents ever. (nothing will ever beat the cutest Siamese kitten ever that I was greeted to when I opened up a present one year)
Especially at that time where everything was so new when it comes to home consoles and gaming. All I knew before that was a few arcade machines like Donkey Kong, Space Invaders...(born in 74') and I remember even being amazed that you can play these games on your tv at home back then.
My dad was always a big sports guy, so he'd get together with his buddies and go at it in the sports games. He even had a little booklet with all his plays written down for NFL Football. You could create your own plays in that game by entering in different 7 digit codes.
He def knew which system to get too....
http://https://www.youtube.com/watch...ature=emb_logo
http://https://www.youtube.com/watch?v=6eFHzsiF76s
http://https://www.youtube.com/watch?v=qXvr1nnOGIM
Jesus, that Atari football..lol