A man was violently sucker-punched in the eye while working out in a Thai gym on Tuesday ... and the guy says the attack all went down because he refused to give up his bench press.
The altercation -- which happened in Pattaya, Thailand -- was captured on video ... showing two men seemingly arguing over some equipment in the weight room.
In the surveillance footage, a man in a light-colored shirt can be seen appearing to ask a man in a dark-colored shirt to use the adjustable bench.
When the guy didn't give up the equipment, the man in the light shirt seemed to grow annoyed, and left the area.