This fan with LED blades can display any message you want, like if it was written in the air:

Via find-me-a-gift.co.uk.

Press this big red button when someone (like your boss…) approaches your office while you’re not really working. It will bring any pre-programmed spreadsheet or any other document on your screen.

Via thegadgetshop.co.za.

Handycooler is a portable air conditioning device. It works on AA batteries but can also be operated using power from USB.

Via gadget-reviews.com.

Anything you note on this digital notepad is saved digitally. No need to write on and look at touch screen, this one operates through a sheet of real life paper.

Found on gifts.com.