Karma, kid. what goes around comes around. you might not have done something to someone at work, but maybe somewhere else in your life you did something you may not have meant to, or even know about it. or this could be banking towards something tragic being avoided later.
just be comforted by the knowledge that karma cuts both ways. who ever wrecked your shit will get theirs. it will all balance out because nature abhors a vacuum.
side note: I used to know a guy whose bad karma was paid back on people around him... until he got popped for manslaughter. he would pick fights with large groups, and we'd all get beat on. he'd rob shit, then later, we'd get jacked somehow(crooked dope deal, etc.). in the end, he was one of five that beat someone to death, but he alone went down for it.