If you put a scope on a piezo, you'll see that it certainly responds to being hit... this application is used in some Burglar Alarm Sensors to detect doors and windows being smashed and with amplification to detect drilling and masonry demolition. Sadly the days of digging into your favourite Bank vault from the sewers (as perfected in France) is long gone... the technology may not have reached rural areas of Bolivia and Peru yet, but the currency isn't exactly changeable at the local wine mart...

Perhaps if you elaborate on your application, (there's different kinds of hits... raindrop and freight train tend to be two ends of the scale that spring to mind) there might be a few better suggestions.