Dangerous USB drives and equally dangerous english language

USB Drives? What an invention? I am currently using a 4GB drive and it costs peanuts (when you buy peanuts in one or two sack-fuls)...actually rs 383 - app 8USD...
Why are they dangerous, and why is english language equally dangerous? This is not a geek post, because i know nothing geeky, so dont worry about tech info, the fun(ny) part comes later on...
now coming to the danger of USB drives..they are so fond of picking up conficker virus, and spread them a lot. They dont show up if your machine is properly virus-walled, they simply remain inactive and does nothing. But if you are not virus-walled, like the stonewall in your company, they start acting up. What is so funny is that many USB keys when used for first time have this virus. Dont know if they spread because the infection is in the machine, but inactive because of anti-virus, but simply latches on when your pendrive is plugged in! But they are dangerous USB drives...
So a consultant colleague of mine has this biometric USB drive, very well protected with an-built anto-virus tool. It was so odd shaped, and I was naturally curious. I asked him why there is cover on both sides...and he said thus, very inadvertently without realizing what he was saying:
"Well, Guru...you see my key has two parts - private part and public part...anyone can see the public part, but cant see my private parts. I need to use my finger for the private part, and it opens only after the initial check is done; otherwise, with several infections spreading easily through these sticks, I can only protect using my finger, atleast the private part"
And my dear readers, that's why English is equally dangerous and damaging!