Since your answer is "never", congratulations. Based on your answer in this area, it appears you are entirely uninhibited when it comes to mentioning new ideas to others. This will serve you well in areas of creative pursuit. You are likely a very open creative individual who knows that not all new ideas sound brilliant, and you are willing to take the chance of looking "silly" or "wrong." Either that, or you work in a very supportive, open minded environment.
Sticking your neck out with a new idea means taking a risk, but without some risk there are few advancements. We've been trained since our early years to "make sense" and to "not look foolish." Logic, rational thinking and linear thought have been drilled into us. Even the standard IQ test mostly measures convergent thinking. But the greatest thinkers of all time were often divergent thinkers. New ideas often "don't make sense" and might sound "silly" or "wrong." Often, "crazy" ideas are a lot closer to "brilliant" than the same old tired "this is the way it is" ideas.