Fry the bacon until browned - about 10 minutes - then drain on paper towels. Cut into 2cm slices while it's still warm
Slice the bananas into 2cm pieces, and cut each piece down the centre to make half moons. Spread the bottom of each half moon with about 1/2 teaspoon of peanut butter. Stick the banana piece, peanut butter side down, onto a square of bacon, and skewer the banana and bacon together with a toothpick.
Melt the chocolate in the top of a double boiler - or in a bowl - over barely simmering water, stirring to melt it. Do not let water or steam drip into the chocolate or it will seize up.
Dip the banana and bacon treats into the melted chocolate until completely covered; place dipped treats onto waxed or baking paper until cool and set.
Serve to astonished family and friends. Refrigerate any leftovers.