Doesn't seem to respond when there is anything written after the link.
[21:49:48] <@user> http://www.youtube.com/watch?v=7kuUHEyCV9g
[21:49:48] <&bot> YouTube Maximum Destruction DOUBLE BACKFLIP ENCORE http://youtu.be/7kuUHEyCV9g
[21:50:01] <@user> test http://www.youtube.com/watch?v=7kuUHEyCV9g
[21:50:02] <&bot> YouTube Maximum Destruction DOUBLE BACKFLIP ENCORE http://youtu.be/7kuUHEyCV9g
[21:50:08] <@user> test http://www.youtube.com/watch?v=7kuUHEyCV9g test test
[21:50:17] <@user> test http://youtu.be/7kuUHEyCV9g test test
[21:50:30] <@user> :<
Though responds perfectly fine to anything as long as the link is last.