Give a BMX to a young kid and you just know that within a day or two there's going to be some broken bones and a lot of tears. Children just love showing off, even when (or especially when) there's a risk of injury involved. You just know that when his mom saw him gearing up for this big jump she was already calculating the medical bills.
Didn't stop her from the shock of her life when he actually attempted it. While his sister actually looks a little bit impressed, she's just waiting for the sickening splash and some wailing and flailing in the water. Which is pretty much exactly what happened. The kid survived, but we can bet that he didn't get a replacement bike next Christmas.