Do a test. Invite a few friends for a "social experiment" to a bar or party and let them wear a couple test shirts. Forward the info to yourself and see if people use it. Do this a few times and you'll have your answer.
That is on the list, I am at the point where I can do that, and may do so next week; but say I get a bunch of people texting in (I am not so much worried about people texting the shirt honestly, I am fairly confident they will), what can assumptions can I make? Or is this a matter of "if people have fun with it, run with it?"