Yeah, knowing Latin in particular will help. I think variety is also good — if you know something Nordic, something Romance, and English, you've got a good start already. Throw in another central-European language like Dutch or German, and you're all set.
Myself, I don't actually really know French, but I knew enough for "ancora" to make sense, especially if you also add some schmaltzy pop
, and a bit of Discworld
(for the "questo"). :)
Heh, and yeah, the title's in German. ;)
Speaking of which, Dutch is actually a good example of this, too. I once read an interview with Alanis Morissette in a Belgian magazine, ten years or so ago, and I actually understood much of it despite not otherwise speaking any Dutch.