You won an obie and the statue is made of brass and you keep that in the safe too.
A brass plaque
A brass coin
A brass key
You have a couple casino tokens and the brass on the tokens is the cause
The brass in the safe
It came in contact with a dessicant packet.
So the medicine cabinet was way off?
You put it inside your deck of lucky cards.
Somebody put a rubber band around the rim
It was in a jewelry store case with other coins and jewelry. The polishes they used had some sulfers in them and they caused the toning.
Can we get another hint?
You went to the beach and dropped it in a towel you were using.
Mother Nature?
It was on a window sill, and you cleaned the windows with some off-brand window cleaner.
In the poker room and somebody was smoking a Cuban.
You took a photo of it with an old flash bulb camera and the bulb exploded.
You were celebrating Russian Orthodox Christmas. One of the invitees was a noob, had a little to much of the high end vodka that was served and...
Giddy up!
It was kept in a plastic case inside a manilla envelope. Then left inside a medicine cabinet in a bathroom and for some reason the exhaust fan...
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