pee and look behind

After having lunch at NUS Arts canteen, I went to the washroom to wash my hands.

There was this guy at the urinal and all this while I was at the washing basin, his head was turned and his eyes looking at me wash my hands. (I could see from the mirror. I not as powerful as him to be able to look behind and do my whatever business) What's so interesting about me washing my hands? I was kinda tempted to do my primary school trick of pushing peeing people to the wall/urinal.

If he had gone through shooting range in the army, he should know "firers watch your front!"