Kids are amazingly bad at detecting sarcasm, due to the lack of shared context. Instead, they rely on vocal cues to identify it[1]. My sarcasm is very dry, and my 15 year old daughter still has trouble recognizing it.

But, with the NSA databases, any government solution will have that shared context, right? (I can't tell if I'm being sarcastic...)

1. http://onlinelibrary.wiley.com/doi/10.1111/j.1467-8624.1990....