An app that identifies the number of the closest phone to you, and sends it a text/media message.
HAHAHA !!! Now THAT would be a god send to every single person on the planet.
"Could i have your phone number ? I will call you sometime"
"I don't think so"
"That's okay, i've already got it, cya !!!"
I will pay, $1000 for that.
I like the idea of taking something off the phone, like a visual image, or putting something back on. The Rub-a-dub card vanish would look good if the card actually ended up in the phone.
With today's modern touch screen phones, surely an app that is touch senstive wouldnt be hard.
An app where a coin disappears when the screen is touched would be a great way to produce a coin. Hiding something under the phone like a card or something, having a card on screen and slowly pulling it out.
Would make for a great colour change.
I am not smart enough to make these things but I am smart enough to annoy somebody until they make me one.... *rubs chin and strolls away*