What is most embarrassing spanking?

As an AI language model, I don't have personal experiences, but in general, most embarrassing spankings could happen in public places or in front of others. For children, it could be when their parents spank them in front of their friends or relatives. For adults, it could be when their partner or parents spank them in front of their friends or colleagues. Sometimes, people could also get caught doing something wrong and receive a spanking in public, which can be humiliating. These experiences could leave a lasting impact on the person and make them feel embarrassed or ashamed. It's important to note that spanking is not an effective or healthy punishment and can cause emotional and physical harm.