Since irony is not so well suited to further compassion and understanding I question in this thread that by categorizing some ideas as a thought experiment there's justification of treating these ideas as well-posed in the scientific sense. I have got three examples: 1) "Doesn't one, by comitting suicide, not actually die but take ultimate control over reality ?" 2) "What happens if we travel at the speed of light ?" 3) "And again I say unto you, It is easier for a camel to go through the eye of a needle, than for a rich man to enter into the kingdom of God ?" Since the third thought experiment could be misunderstood either as bigotry or as another violent act of sarcasm I shall explain to you that I am serious about this and it is only meant as a question about which questions make sense and which don't. More clearly, what constitutes a valid thought experiment ? Do we have to care about validity at all ?