When will people learn to be careful around mikes? This isn't the 1st time this has occurred 
I can't help but to laugh. This is something you always have to remember when you're miked up.
I can't tell you how many times we've been entertained on the set by sound techs who've recorded all sorts of conversations and sounds coming from live mikes. it can get so bad that some actors would insist on removing the mikes everytime they went to their trailers if even for a few minutes, or just to go to the bathroom.
Forgetting you're wearing a mike is soooo easy to do, ...especially if the battery pack is on your back.
Not so difficult to forget if the remote battery pack is taped to your thigh, ...but still, gotta be careful.
In this day & age, even the removal of a mike isn't enough. As long as you're on the set, you always have to be concerned about an overhead boom mike, or even the person next to you being miked up.