I got into a spot of bother when doing national service in the army many moons ago. Went to the pub and took a shortcut across the parade ground and got caught by a regular sargent who kept shouting "Hey you" which I ignored and kept walking. When he caught up with me (he took the long way around) he asked if I was deaf so I said my best friend was Chinese but he was not HEY YU so I didn't think he was talking to me.
He either thought I was that thick I was not worth worrying about or realised he should have addressed me by name, rank or soldier. Anyway he told me to get off which I was happy to do.