This is not a duplicate of Should "Did not do the research" questions be answered or penalised? . It doesn't address the situation where the question is absurd and cannot be answered simply because the request is unreasonable.
I'd like to clarify I am not talking about asking how to work around a limitation.
Sometimes I see questions that not only deserve a "RTFM" but also simply could not be answered because the request contradicts the information provided by the user.
For instance, I want to accomplish X with tool Y that states specifically it was not in any way designed to support the specified feature.
This does not fall under "too broad", "off-topic" and so forth. How are these types of questions supposed to be handled? Closed with "other" or answered with an explanation of why this isn't possible in the first place?