Going to a McDonald's in Luxembourg it was quite amusing to see one person take on 4 orders in 4 different languages back to back. (English, Dutch, German and French)

On another note while most Luxemburgers will speak 4 or more languages, most people I spoke to wouldn't respond if you didn't speak the language they find "native" to their area. Until you then start speaking another one of the languages and they understand you're just a tourist trying to speak one of their languages.

In my experience living in The Netherlands, that's usually Dutch, English and German, but strangelly not French (or at least nowhere as good as the other ones).

That said it's the place were I've met the most natives who could actually speak some more unusual to learn language (like Portuguese, Japanese, Mandarin and so on) - from my sample (and I lived and worked there almost a decade) the average Dutch person doesn't know that many languages but there are a lot of Dutch people (more than what I've noticed in other countries) with a real interest in learning languages beyond what they're taught at school, just for fun rather than out of need.