All right, this guy has way too much time on his hands. I loved playing with Lego, in my younger days, but my designs were always rudimentary at best. A house with no windows; a car with no wheels. That kind of thing.
He's just showing off.
And as for this girl, well, she's just plain nuts. World's smallest pancake? Are you kidding me? You get those things every time you make pancakes. Try it.