Saw one of these threads on an old forum i was on and it was quite good to see what other people knew, little tricks, that your car can do with out you knowing!
1. Air Con goes into recirculation mobe when you put it in reverse and also when you use the front screen wash!!!! (only found that out yesterday!!! )
2. The indicator sound that comes from the instrument cluster gets louder the faster your going!
I know its a bit geeky but add things if you know anymore!