I have a friend whose son would watch The Road Runner cartoons and at some point as he watched Wiley Coyote preparing one of his ill fated traps, the little boy would proclaim, “That not a good idea.”
So this news article falls into the “that not a good idea” category:
Police in Covington, Ky., arrested Gregory Griggs, 19, in October at the USA Motel, a suspected drug market. Though several people were booked that night, Griggs was the one wearing the T-shirt that read, "It's Not Illegal Unless You Get Caught." [Kentucky Enquirer, 10-17-08]
If you are a drug dealer you should not wear a t-shirt that reads "It's not illegal unless you get caught" -that not a good idea.