Updated Monday --- December 17, 2007 -- 1:01pm

We have an update for you on a story we first brought to you Saturday night. Customers of a Fitchburg Starbucks just keep paying it forward.
Now, the store says nearly 600 people have paid it forward as of Sunday night. Many of them inspired after seeing Saturday night's story.

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One customer at a Fitchburg Starbucks "pays it forward" -- causing a chain reaction.

"They told me that we were the 110th customer and that people had been paying for the drinks of the people behind them," says one surprised Starbucks customer.

It's a way to send a little holiday cheer. Pulling up at the drive thru to pay for your coffee and catching the tab for the person behind you as well. It's called paying it forward. A complete random act of kindness that's catching on and fast.

What started out with just one person paying it forward has now turned into hundreds. And when the person at the drive through finds out what the person before them did, they can't help but pass the spirit of giving along.

"I thought it was very generous. It was just a nice thing to do you really don't run into it a lot. It's nice to know the Christmas spirit is alive and well."

Starbucks employees even have extra money that customers have left behind just in case they run into a Scrooge or two along the way. They also have ways of passing along the holiday spirit of giving themselves.

"We're passing the cheer for families in need through food and toys and clothing donations that come from our customers and will be distributed this upcoming weekend to make it a Merry Christmas for a family that is less fortunate than us," says Starbucks district manager, Rob Gurke.

Something as simple as a cup of coffee is now bring a little joy to the world.