mis-taken waving

When you think someone is waving to you , and you eagerly wave back saying hi just to find out the person is not actually waving to you, but the person behind you. This results in extreme humiliation , and failure to know what to do next.

Kelly waves at Suzie
Jackie thinks Kelly is waving at her and waves back , eagerly.
Kelly walks past Jackie and hugs Suzie, greeting her.
Jackie stands there vulgarly humiliated, unable what to do next.

Kelly and Suzie talk about how how Jackie has mis-taken waving at Kelly