Why Can't We Throw Things at People More Often?

Sometimes, I wish it were more socially acceptable to throw things at people. Not hard, blunt objects (though believe me, there are times I want to throw those at people too), but more as a way of getting their attention. For example, let's say you are in a restaurant and you are trying to get a waiter's attention. The waiter is standing a few tables from your own, but they are facing the other direction. What can you do? Should you rudely and loudly bark "Excuse me!" or (if dealing with a waitress) "Miss!"? Tell me that it doesn't feel incredibly rude to do so, let alone disruptive to the other patrons to yell across a nice but relatively quiet restaurant.

What if, instead, you could just throw your napkin at them? No loud barking, much less disruption to other restaurant-goers, and it would instantly get their attention, no? But of course, you can't do that - the waiter/waitress would be offended and angry. Throwing things - even soft and painless things - at other people just isn't considered socially acceptable. But perhaps it should be.