Three thieves mugged the owners of a jewellery shop only to discover they had only stolen their packed lunches.
The trio thought they had planned a "sophisticated" heist, but came away with just a Tupperware box and some sandwiches.
They targeted a husband and wife who own a jewellery store as they closed the business for the night.
Suspecting the bags the pair were holding contained high-value jewellery, Qasim Hussain, 28, Hassan Mahmood, 26, and 27-year-old Naheem Hussain attacked the couple.
It was... carried out with a degree of sophistication, but ultimately gaining you nothing but your convictions
Judge Tom Bayliss QC
They struck outside their premises in Leeds, West Yorkshire, punched the man in the face and fled with the holdalls. Leeds Crown Court heard the bag only contained groceries and a lunch box.
Jailing the trio for a combined total of 21 years, Judge Tom Bayliss QC said: "In the event you came away with virtually nothing but Tupperware and sandwiches.
"It was a professionally planned, commercial robbery carried out with a degree of sophistication, but ultimately gaining you nothing but your convictions."
During the trial, a jury heard how the men had driven to Halifax, West Yorkshire, two days before the incident and stole a car that they used in the robbery.
The vehicle was caught on CCTV a day before the attack as they carried out a reconnaissance mission.
Mahmood, a medical sciences student, provided the balaclavas and arranged for the vehicle and other evidence to be torched after the raid.
They set fire to the car, but firefighters managed to put out the blaze and recover the balaclavas and DNA was recovered.
The three were found guilty of robbery, assault with intent to rob and theft after a trial. Qasim Hussain and Mahmood were both jailed for nine years, while Naheem Hussain was jailed for three years.