I know it should be easy to open one of those plastic grocery bags but it's always a challenge for me.  I just want to lick my fingers but I know that's gross!  So, I try to be a nice clean black man and open it with my dry fingers and I can never do it.  This really happened in a grocery store in Japan when I was trying to get the bag open.  A nice lady was bagging next to me and made it very obvious that she was patting her fingers on the wet sponge.  Thanks to her, I learned very quickly about another great tool for convenience in Japan.  The wet sponge!  Don't forget to talk about stuff like this in the FORUMS!  Thank you.