My euro w123 wagon lets you put the windows up or down without a key in the ignition if the driver door is open. Initially I thought it was for safety reasons. I've used it a ton as I always forget to check if the rear windows are down so I've begun to wonder if that's what it's for.

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1983 300TD 240k Thistle Green Auto (Euro) [sold]
1984 300D 240k Petrol Green Auto
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"You know, times are changing. Ladies can do stuff now and you're going to have to learn how to deal with it."
"What? Were you saying something? Look, I don't speak Spanish."