I think its interesting to see so many different Pesach minhagim.
Peanut butter on matzah was one of my things growing up before I knew about kitnyot.
Apparently there is a segulah on the afikomen for childless married couples. If this is a real segulah, it makes sense because the Pesach seder is very kid centered. I went to a seder at the home of a couple who have been married for about 11 years with no kids. The bribe or exchange for the afikomen is going around the table and each guest gives the couple a bracha to have children.