This looks really cool. It's just a wave of sand being thrown in the air:
http://youtu.be/nBhFsuB5AKc
Man, that is kinda hypnotic...
You see the chicken? That poor, poor chicken?
Chicken knew what it was doing LOL
Also I believe this is the More Pistons mod (as seen here, except with TNT): http://youtu.be/qb3SNKK-GIE