I had that happen in the paperchase in town on Saturday. Me browsing cards, woman standing practically infront of cards rearranging them. Me browsing pen and pencils, up bops the same woman. I think she was following me...

All this and the fact one person was serving (there are two tills) and the queue was mahoosive. But no neat rows of pencil sharpeners are more important and probably wasn't her job to serve customers, but infact to get in their way.