The snowflake has totally desensitized me to the warning chime in the car. I bought my BMW in winter and it was cold enough that the snowflake alert would chime when I first turned it on. I easily ignored this since it just spammed during the seatbelt warning. (It doesn't even wait for the seatbelt chimes to finish, it sloppily interrupts instead.) Then as it got a little warmer, it would chime while I was driving and send my heart into my throat. I'm accustomed to cars that chime at me when driving only when something really bad is happening like a flat tire or engine problems. But no, in a BMW it means the outside temperature has just hit 37 degrees. This time of year it is constantly blinging at me.
It really throws off passengers too, like WTF is that? After I explain it to them, they appreciate the idea, but they don't have to live with it every day for half of the year...