When you’re a criminal defendant and your lawyer is picking a jury and asks by a show of hands if anyone has ever been convicted of a felony, don’t raise your hand.
I was up for jury duty recently and the lawyer asked for a show of hands on drug convictions. Nearly every hand was raised... Not mine and I was the first one dismissed.
On a similar note, when out to impress, don’t wear a “I have friends in low places” t-shirt.