But the scouts didn't let the crooks get away without a fight.
Officials said it happened around 1:50pm Saturday in front of the Walmart on Grand Parkway at Bellaire.
It started out as a smooth morning selling girl scout cookies, but members of San Jacinto Council Troop 29512 said things changed for the worse about four hours into their day.
According to deputies, that's when two men pulled up in an older model, dark-colored Toyota Camry. The passenger got out of the car.
"A guy jumped out and he just started asking us what kind of cookies do we have," Cadet Senior Iravia Cotton said.
Suddenly, officials said the man ran over to the Girl Scouts' table and and grabbed their cash box. He then tried to get away.
"Who steals from a Girl Scout? I mean, seriously? That's like the worst thing ever," Cadet Senior Rachel Johnson said.
Instead of running for help, Johnson and Cotton chased the thief.
Authorities said one of the girls punched the robber.
"I started hitting the boy who was in the passenger seat. So I think he learned his lesson a little bit," said Cotton, who ended up with a busted lip.
The other girl chased the car and grabbed it as it moved, but was shaken off and dragged.
"I was, like, running with [the car] at first, and I sort of fell down, and I was dragged for a few seconds," Johnson said.
Johnson had scrapes and bruises. No major injuries were reported.
Looking back, the girls and their parents admit chasing after a thief was a dangerous thing to do.
"It was an adrenaline thing. It was, like, you know? One of those things that you have a reaction to, you know? Somebody take your money, you are going to go for it," Cotton said.
Johnson just had one message for the robber: "I hope your face hurts from when Iravia punched you."
Unfortunately for the troop, they will be responsible for the money lost in the robbery. We are told the cash box contained about 20 cases worth of cookie money, or $200.
"I guess a warning to other troop leaders is go through and clear out your cash box periodically to make sure there's not heavy duty cash in there," Troop Leader Jeanne Marie Johnson said.
The girls describe the cookie money crooks as two tall males in their late teens. The man who grabbed the cash box was black, they said. He was riding as a passenger in the car.
FBCSO investigators have surveillance video of the incident, but they said the footage is blurry. The suspects also reportedly had a piece of paper covering the back license plate on the vehicle.
Authorities are asking anyone who may have witnessed this crime to call FBCSO.
Please stay with Eyewitness News and abc13.com as we continue to follow this story.