1 (16 oz.) or 2 (3 3/4 oz.) boxes vanilla Jello pudding
2 c. milk
6 oz. sour cream
12 oz. Cool Whip
12 oz. box vanilla wafers
4 bananas

Mix milk and vanilla Jello pudding together. Then add sour cream. Keep beating on low speed and fold in thawed Cool Whip. In a large bowl, put 1/2 vanilla wafers, 1/2 bananas and 1/2 pudding mixture, then do same again, topping with vanilla wafer crumbs. Cover and refrigerate.