Popular URl shortner Bitly allows users to customise its links. This means you can have all sorty of weird and wonderful character in there. For example:
You can also use Emoji!
Well, OK, not all Emoji. If you try to use most of them, the Bitly system craps out and generates broken URls, like so:
But you can use most Unicode Miscellaneous symbols - some of which may have Emoji style representations on your system.
Please use this forbidden knowledge wisely.