When did snow last surprise you?

I've been looking at snow for years - reading layers, tracking faceting, knowing when it'll slide. But sometimes it still does something I didn't expect. A skin track that felt stable at dawn but turned into a wet slab by lunch. An old cornice that collapsed hours after I passed under it. I'm curious if you've had that moment this season where the snow reminded you it's not a math problem, just a slow conversation. What did it do?