How do I spawn a Slime that can be used as a soccerball in vanilla Minecraft?

I'm wondering how to spawn a slime that has no AI and that can be pushed and knocked around like a soccerball. I've noticed that when I remove the AI it also loses any knockback effect.
Is there a way to do this? Whether via command or by other methods is fine by me. I'm in snapshot 15w42a.
Best Answer
Ok I think I figured it out use this command:
/summon Slime ~0 ~1 ~0 {CustomName:Ball,CustomNameVisible:1,ActiveEffects:[{Id:2,Amplifier:20,Duration:999999}]}
This spawns a slime that can't move anywhere, and then use a weapon with knockback enchantments.
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How do you summon a soccer ball in Minecraft?
10 best Minecraft console commands- /tp - teleport.
- /summon - delivers an in-game entity to your location.
- /difficulty - root command for changing difficulty setting.
- /weather - root command for managing weather in your world.
- /gamemode - root command for selecting game mode.
How do you make soccer in Minecraft?
Slimes spawn in all light levels, and if the room is free of water, the game won't "think it's still an ocean". The chunk is under the ocean floor. So no water. And slimes can spawn at any light level.Minecraft Tutorial - How to get Slimes to Spawn
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Answer 2
Here's my idea: You spawn a slime, give yourself a knockback weapon 1 then an infinity bow with punch 8 or 9 for scoring the goal. And i think you need friendly fire to prevent knocking players away.
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