Pistons can be activated by putting a torch or redstone block one block above using a block beside(see picture)
*What I expected to happen was the piston to not extend
*What actually happened was the piston became powered and extended
Steps to Reproduce:
1. Put a piston facing upwards on the ground
2. Place a block beside the piston
3. Put a torch on top of the block
Was found in version 1.5.2
Environment
Put your operating system (Windows 7, Windows XP, OSX) and Java version if you know it here
178th duplicate of MC-108.