Got some rolls of dollar coins from the bank today, partially because they're fun to try and use (a lot of people don't recognize them) and also because I collect coins. Amongst my dollar coins I found the following three non-US coins, all of which are roughly the same size and weight as a dollar coin:

500 Korean Won (~$0.534 equivalent)
1 Indian Rupee (~$0.025 equivalent)
2 Euros (~$2.944 equivalent)

As you can see, these three coins are worth a total of about $3.50, so just by changing money from bills to coins I made 50 cents. Woo! I knew my coin collection would one day pay off.