There's a pango bug that leads to certain programs such as Hexchat and Termite to crash. It's going around IRC and can be output via
/exec -o python3 -c "print(u'hey \u2665\ufe0e\ufe0f')"
It seems to print "hey" with a heart emoji after it. When viewed from irssi running in termite, my whole terminal closes instantly. I have irssi running in tmux, so as soon as I run 'tmux attach', I see the whole window disappear. I'm able to safely view this text from urxvt, so I can then /clear my irc window or change to another channel.