It's impossible!

I have spent the better part of the day trying to solve the anagram in this comic:

http://www.qwantz.com/index.php?comic=1663

I can't do it without more hints, and I'm usually so good at word puzzles.  There had better be an answer tomorrow or something, because I have to know: WHAT DOES T-REX SAY?  IT'S PROBABLY NOT IMPORTANT BUT I AM CURIOUS NONETHELESS!

(The all-caps are meant to both channel T-Rex and denote intense curiosity.  It's not shouting, promise.)