Its rare to find devs anticipating Unicode control characters showing up in user input. And the most fun when unanticipated is the Right-To-Left Override character U+202E. Unicode characters have an implicit direction so that for example by default Hebrew characters are rendered from right to left, and English characters are rendered left to right. The override characters force an explicit direction for all the text that follows.
I chose my Twitter display name to include the HTML encoding of the Right-To-Left Override character
#x202E; as a sort of joke or shout out to my favorite Unicode control character.
I did not anticipate that some Twitter clients in some of their UI would fail to encode it correctly. There's no way I can remove that from my display name now.
Try it on Amazon.
The ordering of the code points does not make it simple to do this. I initially guessed the first code point in the range would be 12:00 followed by 12:30, 1:00 and so on. But actually 1:00 is first followed by all the on the hour times then all the half hour times.
drawille - Drawing in terminal with unicode braille characters
Uses the Unicode Braille characters to make advanced (non-)ASCII art.