Was randomly targeted with an IRC direct message by someone who didn’t have a firm grasp of English and wanted to know what ‘due date’ meant. After puzzling out that they actually just didn’t understand ‘due date’, I explained the concept to their satisfaction.
This of course made me ask where the person should have checked instead of bugging random IRC people who happen to be english, so I checked Wikipedia. Lo and behold, there was a page about it, but only defining ‘due date’ in terms of pregnancy (which I hadn’t even considered). Luckily it’s Wikipedia so I just added a more robust definition: Due Date @ Wikipedia.
Best part: Getting to make a wiki link to the page about ‘homework’, which apparently needs more citations ;)