I've seen many of these bad grammar t-shirts, here in China. While watching a movie one night, a young woman, came on during the break and I noticed she was wearing a t-shirt, with the words " Did you cum nice"?. Somewhat of a shock to me, to see this being worn on television.
Another example, a female student of mine, was wearing a t-shirt saying, "C'est une idiot", asked her if she knew what that meant, she had no idea.
Unfortunately, I don't have pics to show here but sad but true.