I cannot open those tins - I even used the special can opener hook my friend gave to me - as I have an arthritic condition I can't open a list of stuff. I've even been know to go next door to open various bottles that are welded on with plastic stripping. As for corn beef tins - forget it! I struggled for ages, neighbours were out, in the end in my fury I chucked it out. Can't open most plastic bags - the list goes on. However, a lot of people without any sort of arthritis etc find those and Spam tins just impossible. Oh and sardine tins also difficult. The design has been that way since forever, as I remember them from childhood.