A friend of mine used to put dog toffee in a paper bag or wrapped in news paper on someones step then set fire to it, ring the door bell ard retire to a safe view point.Upon seeing the burning paper the house holder wouls stamp it out.
Good clean fun.

dog toffee n.

Tacky pavemental dog deposit that will readily adhere to the sole of a shoe or support an upright lollipop stick.

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It dun't really matter.