Foie Gras
Foie Gras, or duck/goose liver, is banned in a handful of countries as well as a handful of U.S. states due to the cruel methods in which the food is created. The Foie is made to be incredibly fatty through force-feeding the birds, and this practice is seen as too cruel to allow in many countries.
#5 cost of removal disposed chewing gum tens and hundreds of millions annually, so...
#3 ketchup has no room in schools, however you look at it.