Back in the 60s and 70s, Las Vegas had payout Bally Bingo pinball machines.

I recall a row of them in back of the Fremont and can still smell the beer and piss as bums (before they were called homeless) would hang there.

One night we flipped the cash-out switch and the count down meter stuck and kept dumping nickels for a few moments before it kicked in.

Another night, my friend left a bunch of credits for the local bums.