Top 20 replies by Programmers to Testers when their programs don't work 
I hear/say these all the time:
"That's weird..."
"It's never done that before."
"How is that possible?"
"There is something funky in your data."
"It works on my machine"
Source: http://justlooking.recursion.org/2006/Nov/27#top-20-replies-dev-to-qa