When my boys started potty training, like most kids, they didn't know they had to be discrete about it. For instance, we were traveling and one had to go, so we stopped at a fast food restaurant. The place was packed and he asked the first employee, rather loudly "Where is your bathroom? I have to poo poo!". Needless to say, it was cute embarrassing, but something I will have to remind him of when he is a teenager.
My other son has the habit of playing with the neighbors, in their yard, and peeing in the flower beds when he has to go. I can't hold that against him too much since us men were made with outdoor plumbing for a reason, but I still hope he grows out of that.