Yeah, yeah, we know that littering is totally disrespectful to our environment. Mario Kart taught us what we always knew deep down: Littering can also be awesome. Throwing a banana peel on the side of the road isn't exciting. Dropping one in order to spin out an enemy go-kart, however, is incredible.
How do you apply this to the real world? A half-finished cold coffee or a warmed over milkshake might not make for an appealing drink, but that doesn't mean it's worthless. When you passed your high school bully's car in a mostly empty Wal-Mart parking lot, there were few more actions more pleasurable than dumping your left over drink on his car and forcing him to take an unplanned trip to the car wash. Mario Kart introduced you to the concept of littering as justice. Don't litter kids, but if you do, make it count.