Someone will definitely get caught. Many people will not even think that this is done for tickling.
I think the OP might not realize just how expensive and or difficult to construct a device of that size and quality would be.
Also, if you're doing it to get your rocks off I don't think it qualifies as a prank lol
That does actually raise the question does this qualify as a prank
Easy answer;
No. No it doesn't.