youtbh is a simple Perl plugin for irssi that reveals the title of youtube links that appear in a channel.
Links will reveal themselves as a message in the current window like so:
22:28 -!- Geoff Berner - Dalloy Polizei - YouTube 22:28 < nosmo> https://www.youtube.com/watch?v=YtmQNeYT3KU
If the message_channel variable is set to 1, the title of the video will be outputted as a message to the channel. Don't be a jerk.
Copy youtbh.pl to ~/.irssi/scripts and then
/script load youtbh.