Brits create app that gives users John Travolta-style chin
Pals Adam Smith and Sam Thornell, both 28, created a programme which superimposes a dimpled chin on to any photograph of a face.
It means anyone can see that they would look like with a cleft chin like the Grease star's.
The app sold 50,000 downloads within 24 hours of being launched and has now notched up 123,000 sales in just 20 days.
Adam, from Batheaston, Somerset, said: "It has all happened very quickly. We weren't expecting that — we thought it would take longer to get that reaction.
"We're ecstatic about it."
The pair got the idea for the app after watching movie legend Travolta strutting around the dancefloor in Saturday Night Fever and in Tarantino thriller Pulp Fiction.
They dreamed up the "Bum Chin Booth" in the living room of Adam's country cottage and designed it within six months.
Adam, a mortgage adviser, said: "We just did it from my lounge, drinking lots of coffee. We don't have an office as such — we don't need one.
Clever idea ... Adam Smith and Sam Thornell with their iPhones
SWNS"At first our families thought we were a bit crazy. They struggled to see it, but we thought it had potential."
Sam, who lives in Larkhall, near Bath, Somerset, wrote most of the programme for the app after learning how to write computer coding from his dad.
They then put it on sale on iTunes, selling for 69p in the UK and 99 cents in the US.
The app took North America by storm, sparking 50,000 downloads within 24 hours of being launched on May 11.
Now more than 123,000 people have bought it, with the vast majority of the app's sales in the US and Canada.
Once iTunes has taken its cut and the exchange rate is taken into account, the duo are making 42p on each sale — equating to £51,660 after just 20 days of sale.
Adam added: "Even if nothing else happens we are pretty happy. But we are hoping it's the tip of the iceberg."
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