A 20-year-old US man is selling advertising space on his forehead to the highest bidder on website eBay.
This model shows how the forehead advert could work
Andrew Fischer, from Omaha, Nebraska, said he would have a non-permanent logo or brand name tattooed on his head for 30 days.
"The way I see it I'm selling something I already own; after 30 days I get it back," he told the BBC Today programme.
Mr Fischer has received 39 bids so far, with the largest bid currently at more than $322 (£171).
"The winner will be able to send me a tattoo or have me go to a tattoo parlour and get a temporary ink tattoo on my forehead and this will be something they choose, a company name or domain name, perhaps their logo," he told the Radio 4 programme.
On the online auction, Mr Fischer describes himself as an "average American Joe, give or take".
His sales pitch adds: "Take advantage of this radical advertising campaign and become a part of history."
Mr Fischer said that while he would accept any brand name or logo, "I wouldn't go around with a swastika or anything racial".
He added: "I wouldn't go around with 666, the mark of the beast.
"Other than that I wouldn't promote anything socially unacceptable such as adult websites or stores."
He said he would use the money to pay college fees - he is planning to study graphic design.
The entrepreneur said his mother was initially surprised by his decision but following all the media attention she felt he was "thinking outside the box".