A retailer has imposed a 'tax' for users who buy products with Internet Explorer 7.
Microsoft's old browser is reviled by many for its continuing popularity despite its poor compatibility with many modern websites.
Kogan, the Australian electronics store behind the stunt, said it will charge users an extra 6.8% - which will rise over time - unless they switch browsers:
"The way we’ve been able to keep our prices so low is by using technology to make our business efficient and streamlined. One of the things stopping that is our web team having to spend a lot of time making our new website look normal on IE7," they said.
IE7 was launched in 2006 but Microsoft has since released two new major versions of the software, and plans to release Internet Explorer 10 in the autumn.
The tax appears to be genuine - though hopefully few, if any, shoppers will be tricked by the move.
Kogan added that IE7 had to disappear for the internet to become a "better place" for shoppers.
"As Internet citizens, we all have a responsibility to make the Internet a better place. By taking these measures, we are doing our bit."
"This will help us increase our efficiency, help keep prices for all smart shoppers down, and hopefully help eradicate the world of the pain in the rear that is IE7!"