diff --git a/.gitignore b/.gitignore
index d176eb3a03..1389147b3b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -27,3 +27,6 @@
 
 # Impact Font
 /resources/font/impact.ttf
+
+# User-accessible hook for adhoc debugging scripts
+/support/debug.php
diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index f9098d0322..fb189ffb9a 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -831,6 +831,7 @@ phutil_register_library_map(array(
     'PhabricatorDaemonLogListView' => 'applications/daemon/view/PhabricatorDaemonLogListView.php',
     'PhabricatorDaemonLogViewController' => 'applications/daemon/controller/PhabricatorDaemonLogViewController.php',
     'PhabricatorDaemonReference' => 'infrastructure/daemon/control/PhabricatorDaemonReference.php',
+    'PhabricatorDebugController' => 'applications/system/PhabricatorDebugController.php',
     'PhabricatorDefaultFileStorageEngineSelector' => 'applications/files/engineselector/PhabricatorDefaultFileStorageEngineSelector.php',
     'PhabricatorDefaultSearchEngineSelector' => 'applications/search/selector/PhabricatorDefaultSearchEngineSelector.php',
     'PhabricatorDeveloperConfigOptions' => 'applications/config/option/PhabricatorDeveloperConfigOptions.php',
@@ -1307,7 +1308,7 @@ phutil_register_library_map(array(
     'PhabricatorSortTableExample' => 'applications/uiexample/examples/PhabricatorSortTableExample.php',
     'PhabricatorSourceCodeView' => 'view/layout/PhabricatorSourceCodeView.php',
     'PhabricatorStandardPageView' => 'view/page/PhabricatorStandardPageView.php',
-    'PhabricatorStatusController' => 'applications/status/PhabricatorStatusController.php',
+    'PhabricatorStatusController' => 'applications/system/PhabricatorStatusController.php',
     'PhabricatorStorageFixtureScopeGuard' => 'infrastructure/testing/fixture/PhabricatorStorageFixtureScopeGuard.php',
     'PhabricatorStorageManagementAPI' => 'infrastructure/storage/management/PhabricatorStorageManagementAPI.php',
     'PhabricatorStorageManagementDatabasesWorkflow' => 'infrastructure/storage/management/workflow/PhabricatorStorageManagementDatabasesWorkflow.php',
@@ -2337,6 +2338,7 @@ phutil_register_library_map(array(
     'PhabricatorDaemonLogListController' => 'PhabricatorDaemonController',
     'PhabricatorDaemonLogListView' => 'AphrontView',
     'PhabricatorDaemonLogViewController' => 'PhabricatorDaemonController',
+    'PhabricatorDebugController' => 'PhabricatorController',
     'PhabricatorDefaultFileStorageEngineSelector' => 'PhabricatorFileStorageEngineSelector',
     'PhabricatorDefaultSearchEngineSelector' => 'PhabricatorSearchEngineSelector',
     'PhabricatorDeveloperConfigOptions' => 'PhabricatorApplicationConfigOptions',
diff --git a/src/aphront/configuration/AphrontDefaultApplicationConfiguration.php b/src/aphront/configuration/AphrontDefaultApplicationConfiguration.php
index df85f35030..2b905038dd 100644
--- a/src/aphront/configuration/AphrontDefaultApplicationConfiguration.php
+++ b/src/aphront/configuration/AphrontDefaultApplicationConfiguration.php
@@ -109,6 +109,8 @@ class AphrontDefaultApplicationConfiguration
           'testpaymentform/' => 'PhortuneStripeTestPaymentFormController',
         ),
       ),
+
+      '/debug/' => 'PhabricatorDebugController',
     );
   }
 
diff --git a/src/applications/system/PhabricatorDebugController.php b/src/applications/system/PhabricatorDebugController.php
new file mode 100644
index 0000000000..e26dd0e6c9
--- /dev/null
+++ b/src/applications/system/PhabricatorDebugController.php
@@ -0,0 +1,39 @@
+<?php
+
+/**
+ * This controller eases debugging of application problems that don't repro
+ * locally by allowing installs to add arbitrary debugging code easily. To use
+ * it:
+ *
+ *  - Write some diagnostic script.
+ *  - Instruct the user to install it in `/support/debug.php`.
+ *  - Tell them to visit `/debug/`.
+ */
+final class PhabricatorDebugController extends PhabricatorController {
+
+  public function shouldRequireLogin() {
+    return false;
+  }
+
+  public function processRequest() {
+    if (!Filesystem::pathExists($this->getDebugFilePath())) {
+      return new Aphront404Response();
+    }
+
+    $request = $this->getRequest();
+    $user = $request->getUser();
+
+    ob_start();
+    require_once $this->getDebugFilePath();
+    $out = ob_get_clean();
+
+    $response = new AphrontWebpageResponse();
+    $response->setContent(hsprintf('<pre>%s</pre>', $out));
+    return $response;
+  }
+
+  private function getDebugFilePath() {
+    $root = dirname(phutil_get_library_root('phabricator'));
+    return $root.'/support/debug.php';
+  }
+}
diff --git a/src/applications/status/PhabricatorStatusController.php b/src/applications/system/PhabricatorStatusController.php
similarity index 100%
rename from src/applications/status/PhabricatorStatusController.php
rename to src/applications/system/PhabricatorStatusController.php