Begin with Q? No.

A pedantic clarification. I answered Yes to "Emotion or feeling?", and that is clearly the best answer. But we might be hesitant about applying those terms to non-human animals, so I should note that there are also senses of the AOTC that go beyond emotion/feeling.

Sorry I'm late, it's the darned traffic.

Involve killing? Not usually. Occasionally, yes.

Syndrome? Well, first, it isn't a "type of behaviour" as such, though it certainly can be associated with certain behaviours. And although it can sometimes be associated with a syndrome/illness, it isn't in itself one.

Normally considered rational? *audience applauds the question* No. In some circumstances quite the contrary. Although it is not always considered irrational, either.
Emoticonned? I was not aware of one, but the google does give me examples. Mind you, if you had just shown me these examples, I would not have identified them as the AOTC.
Begin with non-silent P? Yes. Of course.
Depressing or drepressing? No, not in general. Maybe in some specific circumstances.

Paranoia? No. (I did actually think about making that the AOTC when setting this AVMA.)

Panic? Yes! *throws the baton in Quendalon's general direction and runs away screaming*

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Eeek! Er, I mean, yes! Of course! Success!

Our next selection is obscurely ANIMAL.

[Tuj] Unique? YES.