What was your reaction the first time one of your parents told you an off-color (dirty/adult) joke?

For the first time in forever, my mom told me a raunchy joke this morning at breakfast. I was stunned. Since I didn't laugh she started explaining it to me and I had to tell her "Stop stop stop stop..."

What was your reaction the first time one of your parents told you an off-color (dirty/adult) joke?
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