Yes
There was a famous psychological experiment done (and redone countless times with numerous variations), where they got members of the public and told them that, if they pushed a button, the person they can see in another room would be given a shock, which would increase in power until it proved fatal. Of course, the other person was an actor, and not actually shocked.

Some of the variations on the theme is them being rewarded for pushing the button, or told that the 'victim' was a serial killer etc.

Not all subjects pushed the button until the victim died, but apparently some did.
( Labia Majora You keep on talking but it makes no sense at all, Tue 17 Aug 2010, 11:43, 2 replies, latest was 16 years ago)

I'm well aware of this experiment. It is very famous.
I'm not sure I see the relevance though.
( WormuIus, Tue 17 Aug 2010, 11:44, Reply)

It's relevant in that
Someone, who could be taken to be 'reasonable', is being successfully provoked into committing murder.

You could argue that by the subject showing the proclivity to murder, that they are not 'reasonable', but that's with the benefit of hindsight.
( Labia Majora You keep on talking but it makes no sense at all, Tue 17 Aug 2010, 11:46, Reply)

Forgive me, but that isn't being 'provoked', it's being 'encouraged'

( WormuIus, Tue 17 Aug 2010, 11:49, Reply)

people just need to be given
a reason and a figure of authority to justify it
( Citizen Cavy Admires your passion for conformity, Tue 17 Aug 2010, 11:49, Reply)

It was a whole group of experiments by Milgrim
It was about obedience, how far people will go following orders from a authority figure.
(PsychoChomp, Tue 17 Aug 2010, 11:47, Reply)

See also Stanford prison.

(PsychoChomp, Tue 17 Aug 2010, 11:47, Reply)

That's it, I didn't study it, just have read about it
You could argue that following orders to kill is provocation, and thus fits the original question.
( Labia Majora You keep on talking but it makes no sense at all, Tue 17 Aug 2010, 11:48, Reply)

Only if you didn't know what the word 'provocation' meant.

( WormuIus, Tue 17 Aug 2010, 11:49, Reply)

Apologies
I wrongly assumed you could provoke someone else to do something to a third party, rather than provocation being a strict two-party affair (victim provoking assailant).
( Labia Majora You keep on talking but it makes no sense at all, Tue 17 Aug 2010, 11:52, Reply)

it is possible to have 3rd party provocation
but Wormulus is still right, they weren't provoked to kill, merely encouraged
( Amberl was stripey and dominated Europe, Tue 17 Aug 2010, 11:53, Reply)

Would encouragement become provocation
If there was a penalty for not going through with the task? (and assuming no prize for doing it)
( Labia Majora You keep on talking but it makes no sense at all, Tue 17 Aug 2010, 11:54, Reply)

no
it might become coercion (though coercion is not a defense as it happens for murder) but it's still not provocation
( Amberl was stripey and dominated Europe, Tue 17 Aug 2010, 11:56, Reply)

Gotcha, thanks :)

( Labia Majora You keep on talking but it makes no sense at all, Tue 17 Aug 2010, 11:56, Reply)

If the penalty was serious harm to you or to people personally know to you or you or their property
then you can offer a defence of duress to certain crimes. Not an unlawful killing though.
( WormuIus, Tue 17 Aug 2010, 11:57, Reply)