Boards
The Carling Taste-Lock Can
http://www.carling.com/beer/tastelockcan
Laying aside the question of anyone actually wanting to lock in Carling's taste, who's ever had a drink from a can where the flavour wasn't 'locked-in'? Who's ever had a drink from a can where they tasted a 'tinny' flavour from the can?
(Let's not even go down the path of it being aluminium and not tin so the flavour would probably be Bauxite-y or something.)