Once, buying a swiss roll to go into a trifle, I inadvertantly bought a chocolate flavoured one. The girl friend accused me of seeking to sabotage her cooking...

However, when Rowntree's added a Black Cherry flavour jelly (Jello) to their range, my earlier mistake prompted the creation of a Black Forest Trifle, using cherries, whipped cream & kirsch. It's now one of my signature recipes.