This happens in both gamemodes:
When throwing a Potion of Instant Health Level X BEHIND a Zombie/Skeleton would knock them AWAY from YOU, and not from the health potion. This may be used to people advantage in combat. (It wasn't tested with Harming Potions but I'll assume it's the same)
Comments 3
Is this still a concern in the current Minecraft version 1.8.1 Prerelease 3 / Launcher version 1.5.3 or later? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
Confirmed in version 1.7.2. Also works on the side of a Skeleton/Zombie.