I was flying back from a weekend with my girlfriend this morning at PHX. She had baked a red velvet cake for me (keeper!) and I had two pieces in tupperware containers in my bag. After it went through the x-ray machine, the woman at the montior gestured to her partner to open my bag and search it. When she found the containers she breathed a sigh of relief and turned to the woman at the monitor and said "they're just cakes, should I run it again?" to which she recieved a no.

Any idea what they showed up as? I can see why carrying batteries or camera parts would look weird, but cake in tupperware?