MC-140813 revealed an easter egg that occurs when a player punches a panda near a villager; the villager produces angry particles, as if it were hurt. However, this is also the case when the villager has no AI; if a villager has no AI, it doesn't produce the particles when it (the villager) gets hurt, which is why I believe this is a bug.
How to reproduce:
Spawn a panda
Summon a villager with
NoAIset to1b.Punch the panda
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Yellow01
This.... isn't a duplicate. 😛
I discovered it while gathering info on the panda and villager "bug".
This bug report simply states that the "bug" also occurs when the villager has no artificial intelligence, which probably isn't intended.
[Mod] Neko
From MC-67667:
Any part of an entities behavior that is not implemented as part of the AI is not affected by the NoAI tag.