As first you must have at least 4 block tall.Then place torch on the third block and place sand or gravel up. Destroy the block above torch, then sand or gravel will fall down "pass" torch.
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Fora simple player who doesn't know about entities and so on, the weird thing is that regular sand sits on torches but falling sand doesn't. So this behaves somewhat inconsistent.
Didn't sand falling on a torch previously cause the sand to turn into an item? I've read about people using that as a fast way to harvest sand and gravel.
Falling blocks are entities, which pass through non-solid blocks like mobs and players. Not a bug.