Greg and Stacye Terry, left, were handed a bag full of cash instead of their order at a local McDonald's drive-through in Tennessee.

When Greg and Stacye Terry drove up to their local McDonald's in Hermitage, Tenn., for a customary breakfast stop, they got a little more than what they ordered: a bag full of cash.

The Terrys, who live down the street from the fast food franchise, drove home after collecting what they thought was their drive-through breakfast Tuesday morning. When they arrived home, however, they opened the bag to find three Ziploc bags full of cash that the employee had mistakenly handed them instead.

"We were both shell-shocked - when do you ever go to any place, and they just hand you money?" Stacye Terry told ABC News today. "We just kind of stood for a second and were like, 'Let's get in the truck and take it back.'"

They later learned that the money was intended for a bank deposit.

While the Terrys were pulling out of their driveway, they saw a McDonald's employee pull up into their neighbor's house.

"She looked like she was going to cry, and seemed very relieved to find us," Stacye Terry said.

The Terrys volunteered to return the money to McDonald's and pick up their breakfast. They are not sure how much money was in the bag.

"It wouldn't have mattered if it was $5 or $5,000, it didn't belong to us," said Terry. "We would expect everyone else to do the same thing."

The Terrys didn't get their meal for free, but no hard feelings. "It was an honest mistake they made," said Terry. "We definitely don't expect something for doing the right thing."

Phil Gray, owner and operator of that franchise, offered his thanks.

"We are grateful for this customer and the action they took upon realizing our error," Gray said in a statement today. "We are looking in to why this mistake happened, but what is most important for us is knowing that we are part a community with the values that were evidenced by this person's actions."