I was cooking dinner a few nights ago when I heard my son come inside with what I would call ‘a bit of a cough’. He wasn’t complaining, but the cough irritated him just enough to fetch himself a cup of water to soothe the tickle. He didn’t finish the water, and probably an hour later I drank the remaining contents as I was a little thirsty. 

Sounds pretty boring, a fairly natural thing to do, nothing too remarkable