"I was in a casino, and saw a doddering old man sitting not at a slot machine but at the change machine. He fed in dollar after dollar, and would cheer and call out 'I won again!' every time it dispensed his quarters. It was harmless, and better he 'play' that than lose at a real slot machine, so I left him alone with his fantasy.
I saw him again the next day. I pointed at the change machine and asked why he wasn't playing that one since it was his favorite yesterday. His reply: 'It was dispensing six quarters for every dollar until they fixed it.' "
We wondered why $1 coins weren't in circulation.
FWIW, $1 coins were (and are) in circulation, but not very common and probably not accepted in payphones. The NYC train and subway ticket machines have dispensed $1 Sacagawea coins as change for as long as I've used them.
Coming from the UK with £2 coins in widespread circulation (worth over $3 at the time) we hadn't thought to prepare for this.