LOL the last one
Whenever I'm playing my music loud and I pull up to a red light near other cars I always turn it down. But that could just be common courtesy.
If my windows are down they need to be at the same level. For example if the driver side window is half way down the passenger side window needs to also.
Lights always have to be on so other cars see me before changing lanes or whatever.
that's all I got and some of them you already mentioned. cool topic btw