i'll be honest... i actually am not a fan of trifle:(  but i love this dessert!  the texture is different than a traditional trifle since it has brownie instead of cake & mouse instead of pudding.  it stays moist without getting soggy.  i love the flavor & you could do so many variations on it as well!  you could trade the Symphony bar out for Snickers, M&M's or peanut butter cups.  or if you wanted to go the mint route- use some grasshopper cookies or just some oreos.  or you could add hot fudge or caramel sauce.  play around with it & make it your own.  have fun with your food!:)
{Sheridan's brownie mousse trifle}
1- family sized boxed brownie mix
 1- 3.9 oz. box instant chocolate jello pudding mix
 1/2 cup water
 1 can sweetened condensed milk
 2- 8 oz. containers cool whip whipped topping, thawed
 1 king size Symphony candy bar, finely chopped
 
 Prepare brownie mix according to box directions & cool completely.  Cut into 1 inch squares.
 In a large bowl, combine pudding mix, water & sweetened condensed milk.  Mix until smooth.  Fold in 1 container cool whip.  Mix until no streaks remain.
 In a trifle bowl or large glass bowl: layer 1/2 of the brownies, followed by 1/2 pudding mix, then 1/2 the other cool whip container.  Repeat layers.  Top with candy bar & refrigerate 8 hours before serving.