An arrow will stuck inside a Sand/Gravel block.

How to make the bug:
1. Make a little 1x2x1 tower with any block
2. Shoot an arrow where the tower begins
3. Put a block of sand next to the top of the tower
4. The falling sand will fall on the arrow
5. Break sand block, the arrow will still be there

There is a way to do a similar thing, but with obsidian, but its too complicated