I used to be fluent in German, but didn't use it for 20 years so it is now very rusty, although I sometimes think in German still. Just short phrases -- my brain often serves up "Wo bist du?" instead of the English, or "Was ist es?" I have studied/am studying Latin, Russian, French, Welsh, and Scottish Gaelic, but wouldn't describe myself as even competent at any of them. I understand and speak Scots as well as English and Scottish English, although the really broad Doric still flummoxes me when mumbled or spoken very quickly (or both, which seems to happen a lot where I live). I can read ingredients lists in pretty much any Indo-European language, and can understand the gist of most Germanic languages, although often couldn't tell you exactly what was said.
Sam