Today, i was sitting at my desk at the office, after

Today, i was sitting at my desk at the office, after office hours cause i had so many task need to be finished i was really busy working and concentrating on what i was doing, and suddenly something strange happened to me i suddenly came (aka ejaculated) with no reason i was embarresed by what happened, even though there were no one at the office at that time and i had to go quickly to the men's room to clean the mess in my underwear i don't know why this thing happened to me? i don't have any problem with my reproductive system nor with my prostate which was inspected few months ago (part of my yearly full checkup)