According to the Riverside County Sheriff's Department, the altercation took place after the unidentified victim approached Villalba, who was working the drive-thru window at the Hemet branch, and claimed his order had not been properly filled.
An argument ensued, and the exchange soon became physical. Officials say it was then that Villalba pulled out a knife and stabbed the customer in the stomach.
Villalba was booked into the Larry Smith Correctional Facility on suspicion of assault with a deadly weapon. The victim was rushed to the hospital by his friends, and is said to be in serious condition, but is expected to survive.