Prepare the cake mix according to the package directions
in a bundt pan.
Fifteen minutes before the cake is finished baking, mix the milk and 
sugar in a large skillet over high heat.
Stir to dissolve the sugar and bring to a boil.
Remove the cake from the oven when only 10 minutes are left,
and slowly pour the syrup over the cake.
Return the cake to the oven and let it bake another 8-10 minutes.

Prepare the cake mix according to package directions and
cool after baking. Drain and reserve the pineapple juice.
Place the reserved pineapple juice, the sugar, and the butter in
a 2  1/2-quart saucepan over high heat.
Bring to a boil,then immediately reduce to a simmer
and cook for 20 minutes, until the mixture is thick and the 
consistency of icing. Mix in the crushed pineapple and spread
on the cooled cake.