I was walking out of my bank the other day and struck up a conversation with a guy loading a huge box of 1/2 dollar coins into his car. He explained that he makes money by sorting through the half dollars to find the real silver ones. After talking for a bit he hesitantly showed me how you can quickly sort through them! The real silver 50 cent pieces are worth $5 each if they're 1965-1969, and $12 each if they're 1964 or before.
To sort then you dont have to look at the dates.. you just cut the roll of coins on the side and quickly scan for the ones that have a smooth edge rather than the knurled (bumpy) edge. It's a very fast way to check them.
So as a Mustachian I had to ask him what kind of return he was getting.. he said he takes out $1000 worth of half dollar coins every week, and of those 2,000 coins ($1000) he'll normally get 5-7 silver coins, about half of those being the 1964 or earlier.. That means making $50-60 per week doing this, or $200-250/month. Huge amounts of money? No... but it's fun! A friend and I did it last weekend and it was a blast. We only found 5 coins in our group, but we had a good time and made a few bucks. Also you can filter through the 2,000 coins very quickly.
It goes without saying that you would then take the rest of the half-dollars back to the bank to deposit them into your account.
If you're bored and want to make a few extra bucks, give it a try!
Note: The guy I spoke to said there are plenty of people who do this exact thing aleady, so the real silver coins are becoming more rare.. So in 5 years this type of thing might not be practical.