Dump a cup of sugar and 1/4 cup water into a saucepan, heat. Stir until the sugar is melted, then leave to boil until syrup becomes a nice toffee colour.
Take off heat. Dump in a big lump of butter (4oz ish?), most of a small tub of single cream (4 floz ish?), and a teaspoon of decent salt. Poss less if butter salted. Stir really fast and be careful; the syrup will boil up against the sides of the pan when you add the butter and cream. Allow to cool slightly.
Whilst syrup is boiling, air pop a load of popcorn. Tell yourself this makes what you are about to do much more healthy.
Tip a load of popcorn into a bowl, drizzle sauce over the top generously, and stir. Win massive Mummy points (from everyone except the paediatrician and dentist) by calling your daughter in to share the treat, grab two spoons, and dig in.
Be exceptionally generous to your daughter by allowing her to lick the bowl. Later, finish the remainder of the sauce yourself whilst watching an old episode of Two Fat Ladies on YouTube, and pedalling frantically on the exercise bike.
But if you're rather more restrained, it would make a wicked sauce for ice cream. I'm thinking it ought to be possible to ripple a layer of it through a thickish chocolate brownie batter too.