Punctuation. Its important.

So this shirt is an attempt at subtle humor. Really Geeky Subtle Humor. Do you get it yet? Want me to tell you? Well, I'll give you a hint. It's its. Got it yet? Just in case you're still wondering, the humor stems from the incorrect use of "its".

So buy this shirt if you a) like subtle humor, b) love grammar, or c) are tired of people who incorrectly use its (or their/there for that matter).