Null
I worked on an API that regularly got requests from the mobile app for GET /users/(null). I think that's Swift, or Obj-C's way of to-string'ing a null?<p>I have a generational suffix on my name. I often include it, and quite often as the proper Unicode character, e.g., "Ⅲ". (Assuming HN displays it after I post this, try to select it; that's one character.) That wreaks a fair bit of havoc.<p>When I was in high-school, I took physics. I was assigned to room, say, 309, to a teacher whose name I didn't recognize. But I knew the teacher in room 309, and she even taught physics. So, I approached her, and asked, "I've been assigned 'Ms. Stewart', but it lists her as being in your room. Do you know what the correct room number is, Ms. Cook?" Right room; it was her maiden name, of course.<p>In my company's HR system, we have to note some contacts, for things like life insurance payouts. My fiancée is one. Then we transitioned to a new system, and the data from the old system was migrated over. Now she's my "fiancÃ©e". (And in a separate system, she's a he, because there was no option for "fiancée", only "fiancé".) Similarly (and a long time ago) I had to fix a contact/directory system when it escaped a '. E.g., it would emit "Marie O\'Conner". PHP magic quotes… <i>shudders</i><p>(Character encodings and anything outside of ASCII, in particular, are an unending fountain of bugs.)<p>Just today, Azure's support system can't handle (among <i>many</i> things) the outlandish characters of "<" or ">". Which is great fun, since it's not like anyone would file a highly-technical support request with Azure… right?<p>The missing hour in the DST spring-forward and the duplicate one on the fall-back are great hunting grounds for bugs, too. E.g., Google Calendar has issues with them.<p>We have a git branch prefix at work that triggers a special CI action. Let's call it "branchprefix/". Every now and then a dev will make a branch with "BranchPrefix/" and the OS X machines all start having issues since OS X's file hierarchy isn't case sensitive. (We've also had issues w/ two files, same name different case. git supports it, but OS X can't cope.)<p>(All the names in this post are changed from their originals, of course. But you get the idea.)