It would appear that Google can’t tell the difference between actual depictions of real violence and hand-illustrated / Photoshop-fabricated haunted house marketing imagery:

This message was sent from a notification-only email address that does not accept incoming email. Please do not reply to this message.
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Hello,

During a recent review of your account we found that you are currently displaying Google ads in a manner that is not compliant with our program policies
(https://www.google.com/support/adsense/bin/answer.py?answer=48182&stc=aspe-1pp-en).

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EXAMPLE PAGE: http://rgvscreams.com/schedule.shtml

Please note that this URL is an example and that the same violations may exist on other pages of this website or other sites in your network.

VIOLATION(S) FOUND:

VIOLENCE/GORE: As stated in our program policies, AdSense publishers are not permitted to place Google ads on pages with violent or disturbing content, including sites with gory text or images.  More information about this policy can be found in our help center (https://www.google.com/adsense/support/as/bin/answer.py?hl=en&answer=105954).

VIOLENCE: As stated in our program policies, AdSense publishers are not permitted to place Google ads on pages with violent content. This includes sites with content related to breaking bones, getting hit by trains or cars, or people receiving serious injuries.  More information about this policy can be found in our help center (https://www.google.com/adsense/support/as/bin/answer.py?hl=en&answer=105954).

ACTION TAKEN: We have disabled ad serving to your site.

ACCOUNT STATUS: ACTIVE
Your AdSense account remains active. However, please note that our team reserves the right to disable your account at any time. As such, we encourage you to become familiar with our program policies and monitor your network accordingly.
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Thank you for your cooperation.

Sincerely,

The Google AdSense Team
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For more information regarding this email, please visit our Help Center: https://www.google.com/adsense/support/bin/answer.py?answer=1342779&stc=aspe-ai4-en.

What cooperation? It’s not like I was given (a) a choice or (b) a means to argue about it.