Kid Food: Lemon Fridge Pie (Dessert)

This is sinfully rich, but oh so worth it...
 
Grab a hammer and smash a packet of tennis biscuits (coconut tea-biscuit type things) into nice little crumbs - either in the packaging or in a ziplock bag.  (Pick out any remaining big bits and eat immediately.)  Melt 1/2 c margarine in the microwave and add to the crumbs, mixing to coat them completely - you may need to add a bit more melted margarine if it's too dry.  Press this into a pie plate, evenly on the bottom (the plate's, not yours - yours will get its share of this dish later...) and up the sides.
 
Open a can of condensed milk (reserve licking rights if there is a child in the vicinity, or share sparingly).  Add enough lemon juice to flavour it nice and lemony - about 1/4 to 1/2 a cup or so, or until it tastes right.  As you stir it in, the condensed milk will thicken.  Reserve licking rights to the bowl, or hide it in the fridge for later before the kid notices.
 
Pour this into your crumb-lined pie plate, refrigerate.  Slice into small wedges to serve.
 
(Best served with strong coffee to balance out the side-of-your-face-gland-juicing sweetness.)