When I was in elementary school (early 90s) our field day included a "tractor race" that was this - two kids in a box racing two other kids in a box. Of course

When I was in elementary school (early 90s) our field day included a "tractor race" that was this - two kids in a box racing two other kids in a box. Of course you can't quite see where you're going, so it's crucial you and your teammate crawl at the same rate. Good times :)