"Capitulating Queens" is a trick by Jim Swain. He was a good friend of Jennings and if Jim says that Jennings liked it, then I'm sure Jennings liked it. Jennings created quite a few routines using gimmicked cards. "Pineapple Surprise" is one of the best and can be found in my book "Jennings '67." He also created an excellent version of "McDonald's Aces" which appeared in Genii sometime in the last three years.