@Jason Togneri re: razors
Er, that'll be because if you actually *read* the regs on what's allowed rather than just assuming that all pointy / slicey related things are a no-no, razors that have the blade(s) fixed in the head assembly and not removable as naked blades are on the list of permitted items. Yer Mach III falls neatly into this category.
To add to the possible confusion here, I've seen some airport posters listing these as "safety" razors. Any fule kno that this term was orginally coined by Gillette to describe their original interchangeable thin-blade razor to differentiate it from the (at the time) standard "cut-throat" razor. So, in theory, you can turn up with an object that has "safety razor" written all over it, yet still have it confiscated despite having a list on display stating that safety razors are explicitly permitted.
Your mileage may vary depending on how far to the right of Genghis Khan the uniformed twat at security is.