Well, I got to work this morning and realized that I had forgotten my quarters. After lunch, I got some animal crackers from the vending machine, and got a quarter (along with a dime) in change. And then a bit later, one of my co-workers bought a candy bar from me (I bought a bunch a while ago so that I wouldn't have to pay vending-machine prices, and I decided to make them available to my co-workers for a bit more than I paid for them and a bit less than the cost in the vending machine), giving me another two quarters. And so now I have three quarters again.
If I had any doubts about whether I was meant to be carrying three quarters, they are now gone.