Place 1 piece of bread on top of another. Cut 4-inch by 2 1/2-inch "casket" shape from longest part of bread slices. Cut 1/2 inch off both corners of top of bread slice. Repeat with remaining bread slices for 8 "caskets."
Separate bread slices. Spread 1 tablespoon peanut butter on bottom slice of each. Top with 1 teaspoon jelly, 3 banana slices and top slice of bread.
Place remaining tablespoon peanut butter and teaspoon jelly in small resealable food-storage plastic bag. Seal bag; gently knead to mix peanut butter and jelly. Cut 1/8 inch off 1 corner of bag. Squeeze RIP (rest in peace) on each "casket" sandwich. Cover and refrigerate until ready to serve.