Is there something moving in the iPad 2?

Hi! I was in the store today looking at an iPad 2 (We don't have iPad 3's to look at yet) and while i was holding it, i felt something tickling my hand and thought ''Oh, okay.. maybe it's normal''. After a minute or so, i felt the same feeling but on the other side plenty of times. Is there something moving in the iPad? It's like a tickling vibrating feeling.

You're all problably thinking that i'm a crazy nutjob, hahaha

English is not my native language..

It felt like something was moving INSIDE the iPad 2 at the store, is it normal?

Oh, okay One question, i heard something about some radiation or what it now was called, could that be it? Maybe i was feeling the ''radiations'' in the iPad?