In my opinion one of the coolest features in Excel is the Auto-filter. It works quite well when using 1 drop down filter but when combining more than 1 it can become quite hairy. In my experiences not many people use multiple filters so it doesn’t particularly matter. The thing that really get’s on my nerves however is the custom widget that is used for the actual drop down. It doesn’t behave like ever other drop down box. Your scroll wheel doesn’t work and if you type into it, it always matches the first letter rather than adding to your search string. I have a sneaking suspicion this is a remnant from an early version of Excel.