I found a link that has the exact quote in text. I got the gist of it right.
http://tvtropes.org/pmwiki/pmwiki.php/Funny/Ghostbusters
Here's a different take on the edited version that includes the rodent line, but instead calls Peck "Wally Wick." A video this time.
http://www.youtube.com/watch?v=uDOi034BEJY
Can't find the weasel line in action, but all good fun.