I use the :thumbsup: emoji in Slack a lot. It supports autocompletion, so for the longest time I got in the habit of just typing :th and hitting enter. Someone added the Chinese character for "thank you", which is registered as :th:, and thus broke my workflow. As I re-trained myself to use :thu, it became natural for me. In the last week or so though, someone added a stupid animated smiley with a thumbs up and registered it as :thu:. I now have to re-train myself, AGAIN.