Better-Than-Sex-CakeFrom the Bakow Babble blog -
The friend who made this cake, made a "from scratch" German Chocolate cake (but I am sure you could use a boxed one if you want) in a 9x13 pan.
Then added these after the cake cooled:
Poked holes in the cake (not quite touching the bottom - otherwise you get a gooey mess) with a chopstick and poured a whole jar of hot fudge (slightly warmed so it was not so thick) over the entire cake.
When you can see the holes again. Pour a whole jar of caramel topping over the entire cake (save just a little for the top).
Pour a can of sweetened condensed milk over the entire cake after the caramel.
Crush 3 Heath candy bars, and sprinkle over entire cake.
"Frost" the cake with a thick layer of Cool Whip and drizzle with caramel.
Crush 3 more Heath candy bars over the top of the cake.
Put in the refrigerator and then try to keep your hands off of it!