When I was 4 my bros used to play madden 94 on SNES.
I asked him what shotgun was, and Well when the quarter would end there would be a gunshot to sound off. I knew nothing of football but told my brother I wanted to shoot the football players. So there was something like an in-game injury where the ambulance would come on the field and I'd hear the gunshot and thought he shot a player.
The rest, I didn't learn anything about football until I was like 12. Thanks in large part to Michael Vick.