But there are so many other things you could do with those coins instead as is shown very aptly in this video by Pes for Coinstar.
Well the best thing you could do is well, save the coins. Go to your nearest two dollar store and get a coin tin or piggy bank to put all your coins in. You can't open them until they're full, and when they are, take them to the bank and reap the rewards. You'd be surprised at how much you put in there.
Or what you could also do is go and splurge it at McDonalds. Find $2 on the street or in your wallet? That's good for soft serve cones for 6 with a little left over. Treat your friends, why not, who doesn't love ice-cream.
You could even go to the illustrious $2.80 store Daiso and spend your hidden change on anything. Stationery, umbrellas, thongs, toys, lunch boxes and more. (Look for stores near you via their website).
You could start a coin collection from all your spare 50 and 20 cent coins. As you've probably noticed by now there are many special event coins with particular depictions, but have you ever tried collecting them all? There's more than you'd think and who knows, perhaps your collection might be worth more than the value of the coins once you're done.
There is so much more you can do with your loose change than just get rid of it as fast as you can. So next time you have some coins in your wallet take a moment to think how much more it's really worth.