When holding down the jump, crouch, and place buttons, you are able to create a pillar of blocks in front of the player. The pillar only reaches 10 blocks tall in survival, but much higher in creative.

How to reproduce:
1. Get some blocks, and look at the ground in front of you
2. Hold down the jump and crouch buttons
3. Hold down the place button
4. You will continue to place blocks, even when you shouldn't be able to.

Video demo coming soon