Make vibration more noticeable?

[anon(153966)]

I notice the vibrate more if I'm wearing jeans, but not trousers. It is almost as if the phone has to be touching my thighs to feel it, or on my desk...

I've noticed if I have an Otterbox on it or an Speck case, I don't feel it or even 'hear' the feedback from the vibrate as often as say without the case...