Yeah, they do. In fact, for the T11 one, you actually say, "Check out this app I have".
However, I've never told them what the app is called, and they've never asked. And I figure that if they do find it, see that it's three dollars, and choose to buy it, they will at least use it as an effect, rather than just revealing the secret. The fact that they paid for it would make it more valuable to them.
Even if they do reveal it... well, it's not that great of a trick, so just blow their minds with a different, "real" one.
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"Using magic to get a girl is like using a boot to catch a fish." ~ hlazlo
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