Autocross in freezing spray. I had to use my credit card as an windshield scraper. Awesome.
Course was really quick, even in the icy-ish conditions. It would have been smarter staying on the stock tires because the RS-3s were chattering with ANY sort of steering input...but I think by my 6th consecutive run they were finally warm enough to make some progress.
I also realized that I need to buy real cold weather pants. And shoes. And socks.