@KatS@drwhax I once spent a few weeks learning German[*] in preparation for visiting a friend who was staying there for a year. Got on the Eurostar, trilingual announcement in English, French and surely-this-is-German-but-why-can't-i-understand-a-word-of-it
(Yes, turned out it was Dutch)
[*] I bought a dictionary and a copy of Der Spiegel and attempted to use the one to figure out the other