You and a coworker are talking about life problems when a third coworker overhears and makes a suggestion. He/She is mentally disturbed but incredibly ingenious. Also you are all in good relations. Your gut reaction is?
I'd say curiosity but that depends on the problem being discussed and the suggestion.
I'm not sure I understand the question. Why would I worry about a suggestion?
Perhaps "worry" wasn't the right word, concerned is a better approximate.