When Redditor Stumpalumpagus's friend was building a sandbox for his kids, he wanted to pour concrete in the bottom to prevent a nearby tree from spreading its roots up into the box. With a suggestion from said Redditor, this dad decided to make the best DIY sandbox in 65 million years.
Since he was pouring concrete anyway, this dad decided to include dinosaur footprints and "fossils" so that when the kids eventually dig to the bottom, they'll find a surprise. Since the kids are unaware of the bottom layer, they will discover it on their own. Whether Dad will 'fess up to his secret or let the kids wonder at their find remains to be seen.
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(Images: Redditor Stumpalumpagus)