Every old larder cupboard in England has a tin of Lyle's Black Treacle in it.
Like Golden Syrup it features the rotting Lion and the slogan "out of the strong came forth sweetness"
Every year the tin comes out and one spoon-full is used in the Christmas cake and occasionally Parkin is baked.
I pulled ours out yesterday to make a rich fruit cake and opened it with a small "pop" - and then noticed a best before date of June 2001. Fair enough, but it looked and smelt OK (it tastes horrible raw anyway so that was no test). And then I noticed the blood curdling warning on the side - "Do not open tins beyond the "best by" date, dispose of carefully, they may explode....." (I presume it may ferment.)
Lucky I'm still here I suppose, but I wonder what my local Bomb Disposal Operative will say when I ring to ask him to make safe a tin of treacle now sitting in the middle of the lawn.