A lot of the time, I don't feel my phone vibrating in my pocket, and it's annoying. I hate missing calls when my phone is right there in my pocket. I'm pretty sure I'm not the only one who has this problem, which is why devices like this Vibrating Bluetooth Bracelet exist.
The not-entirely-fashionable bracelet just sits there on your wrist until you receive a call, at which point it starts vibrating. Funny how that works, eh? It should make it pretty impossible to miss calls while you're wearing it, in addition to making that annoying vibrate sound when your hand is resting on a firm surface. It's available now for $48.