The snow melted and then froze. Nothing gets the blood pumping like depressing the brake and, aside from hearing the ABS buzz, nothing. Bonus points are awarded to the driver that can coolly explain to children sliding with them about the nature of Newton's 1st law of motion. Seeing the understanding in their little faces as the driver gently explains that just because friction is not an option for slowing, other forces can come to the rescue. Hills, more specifically going UP hill, can effectively bleed off speed, as can trees or oncoming traffic. Depending on the velocity, the topic of religion or prayer may come up along with the importance of bringing along a change of underwear.
Now you would think that, with the single digit cold at the start of the week, that the ice on the lake would be pretty thick. It's not as thick as you'd think.