We had four bottles of Grace Fish & Meat Sauce confiscated once while changing planes in Florida from international arrival to domestic connection. Turns out each bottle is 4 1/2 oz. Pained me to see them trashed. I've also had ground coffee (including an open bag) taken and swabbed for explosives after carry-on x-ray (in Houston). They were returned and I was told it was because ground coffee looks like explosives on the x-ray signature.