True, but even short-term contact is unhealthy
Not terribly. A brief exposure to a small amount of mercury isn't going to hurt much. If you ensure that no further exposure occurs, your body is perfectly capable of purging itself of the mercury it absorbed.
When I was a kid a friend of mine had a small bottle filled with mercury. We used to play with the stuff. We would pour it out of the bottle and push it around with out fingers. It hasn't hurt me any... well aside from that third eye. (Just kidding.) I don't think it has caused any harm.