If you throw an item against the stanchion of the piston, the item will fly backwards. It's possible to do this with a channel filled with water and ice too.
Fly backwards range: 2-3 blocks.
Normaly items would only stopped directly in the front of the piston.
Related issues
Comments
Torabi
migrated
What is a stanchion?
Ezekiel
Is this still a concern in the latest Minecraft version 14w05b? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
marcono1234
Confirmed for
14w30c
14w31a
Minecraft 1.8-pre 1
marcono1234
Confirmed for
15w37a
migrated
Can't recreate in 1.9-pre1. Probably fixed. I tested both piston types in all orientations.
Dup/Related MC-1720, MC-1829, MC-3513?