Forget the chalk, permanent marker up another tick in the “strange, but maybe useful” column. Just as there are countless iPod accessories on the market, there will be never a shortage of weird peripherals that find their power from a USB port. Sure, we already get the standard issue cooling fans and the like, but for the really hot days, why not opt for a USB-powered air conditioned shirt?

Yup, you heard me right. If you thought the notorious puffy shirt from Seinfeld fame elicited a giggle or two, wait until you someone rocking this air-filled top. Essentially, you plug the appropriate cable into a USB port and the pair of fans (one on the left, the other on the right) starts up on this otherwise run-of-the-mill collared shirt, keeping you dry and cool.

They’ve really thought this thing through. There’s a switch on the USB cable that allows for fan speed control, and for when you’re out and about, there’s an option that allow you to either throw in a quad of AA drycells, or alternatively, make use of the car cigarette lighter port for the required juice.