I'm not sure it's necessarily that obvious.

I quoted the specific askTSA tweets because other informal Twitter postings indicate that TSA screeners have a history of sometimes forcing travelers to abandon foods (solid, gelatinous, with some liquidous content, etc. etc.).

And [MENTION=879233]geometry[/MENTION] raised a good point, which is that there is substantial liquid content in a deep dish-style pizza. So I think he was right to be concerned, and should be ready for a TSO who might grumble about it (and should be prepared to show the tweets to keep his food).