Re: This leaves open all sorts of pranks!
You never know. I came from the US into Australia, with an 16bit ISA card, along with cables, and they didn't bat an eyelid.
I was flying quite a bit after the Lockerbie attack, when they decided that electronics were an issue - although they really meant "batteries".
I would be carrying a couple of Eurocards. They would always be taken off me and swabbed...
Vic.