A few weeks ago, Lucky Charms pushed out a tweet on their social media asking people to respond to that post with the emoji they would like to see turned into a marshmallow the most.
Assuming that was truthful, and they're really following the votes, there are a whole heck of a lot more people that like the unicorn emoji than I thought...
To make room for the unicorn, the yellow and orange hourglass marshmallow (that I could have never told you was an hourglass) will be discontinued.