The smell of the Rhein, how clear the water is: that I'm scared of seaweed.
Reasons I learned certain German/Swiss words: I learnt the word 'bloed' because someone called me stupid because I couldn't understand them.
How mean 8-year-olds are.
The violent, pervasive rain that comes after hot, humid days and the relief that comes with it.
How good German bread is. Just bread. It's just good.
The kiosks selling Rivella.
How good french fries are here.
That fashion and hairstyles in certain parts of Germany have still not changed since 1992.
That languages come back to you when you're sat not even thinking of them.
TBC.