[orbital-decay]

My favorite is U+202E Right-to-Left Override, which doesn't appear to be listed there. A surprising amount of UIs (apps, sites) can be broken with it as they were never tested with right-to-left writing direction in mind. Even a Unicode reference website that I just used to recall the code is broken by it. [0] Entering RLO into arbitrary input forms for fun can bend spacetime, I swear.

[0] https://unicode-table.com/en/202E/

[emsixteen]

I've blissfully ignored RTL so far, but I know that I shouldn't - I just can't imagine the pain of actually figuring out how to deal with it. :')

My favourite character is the Greek question mark;

[iamevn]

> Even a Unicode reference website that I just used to recall the code is broken by it.

I like to imagine that sites like this have noticed the bug but have the sense of humor to choose not to fix it.

[andreareina]

https://xkcd.com/1137/