This one you will like. Let's take a look at src\Orchard.Web\Core\Contents\Views\Admin\List.cshtml where you can see these lines:
<button type="submit" name="submit.BulkEdit" value="yes">@T("Apply")</button> ... <button type="submit" name="submit.Filter" value="yes please">@T("Apply")</button>
"Yes" and "yes please"? Lolwut?
These buttons are used to submit the bulk editor and filter of the admin content list. Now you could think that those funny values are just jokes. They aren't, remove them and they won't work. Why? I have no idea, haven't investigated; but this is a small detail worth knowing when you develop a similar content listing logic, possibly taking code from the Core.
Happy submitting :-).