You can't prove anything!
Finally, Some Decent Life-Size Human Bone Molds For Making Skeletons At The Beach

Move over sandcastles, because with Toysmith’s Bag O’ Beach Bones Playset (~$26 on Amazon) now you’ll be able to mold FULL-SIZE SKELETAL REMAINS on the beach with its 14 individual bone-shaped pieces. Honestly, I was a little skeptical about the product’s quality at first, but after I saw the 5-star average Amazon review, I knew there was no way 78 serial killers could be wrong. *drop-kicking enemy skull into woods* Get yours today!