Nearly 1,000 red balloons were set off in Yorkshire and 200 of them have £5 notes in them.
And that's not all, as there's also a special gold one that contains £250! Not bad if that was to land in your lap, eh?!
Although they can't be tracked, they can travel up to 15 hours, meaning anyone in the UK could end up getting one.
Mobile casino LeoVegas.com carried out the stunt in order to mark their first year of trading in the UK and their new TV advert.
Shenaly Amin, UK country manager from the company, explained: "LeoVegas.com brings the thrills of the Vegas Strip direct to your mobile and we wanted to extend that even further by giving everyone the chance of finding some extra cash to celebrate our launch.
"We'd encourage people to keep their eyes peeled for balloons floating down from the sky today!"
We definitely will be!
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