I'm always amused by the crazy things people think up to trick people on YouTube. This one actually had many people out there searching for the app on the iPhone and android market. The trick here was that the guy was simply taking a picture and the image he pointed to (claiming it was a new "fish finder app") was nothing more that a screen shot of a fish finder which was stored in his iPhone gallery...
So the lesson here is "if it sounds too good to be true... "
On a side note, if you like playing gags on your fishing buddies, you could have a lot of fun with this video!!!
