"Do you beat your wife only on Friday?."
Actually as that's a query the easy answer is to check the listeners internal model and answer it.
That is an NLP problem, and illustrates that the questions "What does a sentence mean?" reduces to "Queries or updates on the listeners internal model of whatever it's about," even if the listeners internal model is "WTF are you babbling about." No model, no capacity to make a model, means the question (or any sentence) would be meaning-less.*
Recognizing the question is actually a very tricky attack on your personal behaviour is rather more of a general AI question and (I'd suggest) much harder.
*This should be pretty much SOP for NLP, but I've yet to find someone actually state it directly. I'd love a reference. I'm guessing Winograd did so, somewhere, but I've not had time to hit his thesis.