If you spawn in a stationary fireball and try to punch it. It will start to move client side but quickly jump back.

Example command to summon it in.
/summon Fireball ~ ~1 ~

Note this did work for a least one other build. Here is the output of a /version on that build.

"This server is running CraftBukkit version git-Spigot-"ac94a02" (MC: 1.8) (Implementing API version 1.8-R0.1-SNAPSHOT)