Broken Glass Jell-O

I think Jell-O is a Midwestern thing, so if you're from the Midwest you'll probably enjoy this.

4  small  boxes  (3 oz. each)  Jell-O, in different colors
1  (14 oz.)  can  sweetened condensed milk

2  envelopes  Knox unflavored gelatin

For each flavor, dissolve one box of Jell-O in one cup of boiling water. Pour each into a small pan and chill overnight. I had four of these containers of Jell-O.

After chilling the four flavors, cut them into small cubes. 
Carefully mix the cubes up in a 9 x 13 pan.

In a separate bowl, sprinkle 2 envelopes unflavored gelatin into 1/2 cup cold water. After the gelatin blooms, add 1 1/2 cup boiling water and dissolve. Add the can of condensed milk. Stir and cool completely. Pour cooled milk mixture over Jell-O. It does help to take the time to skim off any small bubbles that are created when you pour the condensed milk on the Jell-O pieces. Chill overnight.

Cut into blocks or shapes and serve.