After many, many years of saying to myself "I should watch #SnowPiercer at some point" the point finally arrived tonight and I did, indeed, watch Snowpiercer. I wish I'd watched it earlier.
Naturally, it suffers from a lot of "but how did they...?" questions that were never answered, but the underlying character/social elements were decent. Tilda Swinton was ridiculously good. Chris Evans, very surprisingly, was also excellent.
Very enjoyable.