Adam Savage, the guy from Mythbusters, got past TSA with razor blades. Not just any razor blades.. Long razor blades used to cut foam blocks.
Apparently he had the razor blades, along with nuts and bolts and other metal objects, in his carry on bag. His bag went through the scanner and they didn't say anything! Go TSA!
I should also mention that he didn't know the razor blades were in his bag. He wasn't trying to cause trouble or anything. Watch the video below.