According to the uploader's description, these jolly Russian gentlemen here are opening what is identified as a 70-year-old package of Soviet fighter pilot war chow.
I understand opening it. I do not understand eating it. Why. Perhaps the hardiness and fearlessness one encounters so often on Russian YouTube is due to the admirable characteristics of Russian men. Or perhaps it is due to the strength of their vodka. Anyway. If you find canned food from the 1940s at any point in your life, please. Think of this blog post. And do not eat it.