I think we have all been there. I didn't have a screamer but a runner. The minute we hit a store he would take off. I think he knew the store personnel could be counted on to restore him to his Mother. He started this very young and my very first experience was in a busy shopping mall in Montreal. I was sure someone would kidnap him.
One of our most trying times was when visiting an outdoor market in Burlington, Ont. he disappeared, my friend's son was frantic that we find him and can you imagine we found him in a near by arena racing around the seats.
As for Target when visiting in the U.S. we always love to go to Target and were very sorry it did not make it here in Canada.