I had a similar thing happen to me a few months a go.
A young guy around 14 ish i'd say (they all look the same to me) was walking in the opposite direction to me and when we came about 5 feet from each other he thought that it would be funny (i guess?) to stomp in front of me and shout "AAARGH!" as they obviously like to do. Trouble is, i had some of the metal blazing full volume in my ears so i didn't hear him. I saw the little bugger though, and proceeded to walk straight through him as he wriggled to avoid my lumbering bulk.
Lucky i didn't hear him over my music, i get annoyed when people interrupt my music... like Gary Oldman in Leon
peace and love