My sector Timmins/Cobalt, where there tends to be much less traffic and more conversational times, I've hear my fav ATC guy's mic lock open on him. Other times, like back in April when our weather was IFR and there were 5 holds, each time he keyed his mic, you could here the other guy beside him on the other sector's frequency. And there are other times where I people yelling no, yes, air space and laughing like crazy.