Surveillance video shows the victim fruit at a store on Lafayette Avenue in Fort Greene when the suspect suddenly stabs him in the shoulder with the tool.
The suspect ran away immediately afterward, while the victim sustained a puncture wound.
Anyone with information in regard to this incident is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782). The public can also submit their tips by logging onto the CrimeStoppers website at https://crimestoppers.nypdonline.org/ or on Twitter @NYPDTips.
Police say all calls are confidential.