Do you always count your change after buying something?

I always count my change every job that i've worked has been as a cashier. I've found that some people purposely short the customer for their own personal gain. Here's a good example of why I always count my change. I went to a restaurant and didn't get two apple pies that I ordered on top of that I also didn't get correct change. Basically the ordertaker told me the price with the pies never charged me for the pies and didn't have enough sense to give me correct change.

I always do now because cashiers sometimes do make mistakes. Before I don't count the change and realize that it's lacking only when I arrive home. When that's the case it's hard to complain because you've already left the counter. It's best to count it right there so that if there's a problem it could be acted right away.