I remember, some years ago, I lived in a house that was built on an incline, and the right side of the house had a huge downward slope. Me and a couple of friends would go down in sleds, and try to crash into each other before we reached the bottom.
The best memory, though, was chasing this one kid through the front yard, and he hopped on one of the sleds, and started to go down, but I jumped just as he was going and tackled him off the sled as we both started moving forward. We ended up rolling down the hill, and after we wiped the snow from our eyes, we both said "that was AWESOME" at the same time.