On a somewhat related note, a few years ago I was flying to a mobile phone conference in Barcelona. I thought it would be fun to bring my Port-O-Rotary cell phone along (available from Sparkfun Electronics).<p>I enjoyed hours of fun and merriment going through security with it. Frankfurt in particular was a real bitch, as they called in the bomb squad to dismantle and inspect the phone. After they finally cleared me, one of the guards asked me &quot;What is the purpose of this?&quot; I responded &quot;Because it&#x27;s fun&quot;.<p>At least security in Newark had a sense of humor about it. They took photos of it for a book of all the weird shit that&#x27;s gone through security there (I really hope they publish that someday).