As the number of defined code points in The Unicode Standard grows, there is a corresponding desire to have fonts that can display the characters. However, there are many unforeseen consequences of packing numerous characters from different scripts -- many of which have widely varying properties and behaviors -- into a single font file. I'll examine some of the more common and vexing issues we've encountered in building large multi-script fonts, as well as share some observations of how customers have implemented them. I'll also show some examples and suggest some practical workarounds.