While I was preaching in a church in Mississippi, the pastor announced that their prison choir would be singing the following evening. I wasn't aware there was a prison in the vicinity and I looked forward to hearing them.
The next evening, I was puzzled when members of the church approached the stage. Then the pastor introduced them.
"This is our prison choir," he said, "behind a few bars and always looking for the key."
I resemble this...
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:-)