I have had this happen to me a few times. Really into my work with my ear phones & music playing, can hear nothing besides my music. Turn to the side and my co-

I have had this happen to me a few times. Really into my work with my ear phones & music playing, can hear nothing besides my music. Turn to the side and my co-worker is there waiting on me to go over something. Scares the *$#$ at of me every time.