diff --git a/resources/celerity/map.php b/resources/celerity/map.php
--- a/resources/celerity/map.php
+++ b/resources/celerity/map.php
@@ -9,7 +9,7 @@
   'names' => array(
     'conpherence.pkg.css' => 'e68cf1fa',
     'conpherence.pkg.js' => '15191c65',
-    'core.pkg.css' => '1a4e0c25',
+    'core.pkg.css' => 'fdb27ef9',
     'core.pkg.js' => '4c79d74f',
     'darkconsole.pkg.js' => '1f9a31bc',
     'differential.pkg.css' => '45951e9e',
@@ -176,7 +176,7 @@
     'rsrc/css/phui/phui-spacing.css' => '042804d6',
     'rsrc/css/phui/phui-status.css' => 'd5263e49',
     'rsrc/css/phui/phui-tag-view.css' => 'b4719c50',
-    'rsrc/css/phui/phui-timeline-view.css' => 'f21db7ca',
+    'rsrc/css/phui/phui-timeline-view.css' => 'e2ef62b1',
     'rsrc/css/phui/phui-two-column-view.css' => '44ec4951',
     'rsrc/css/phui/workboards/phui-workboard-color.css' => '783cdff5',
     'rsrc/css/phui/workboards/phui-workboard.css' => '3bc85455',
@@ -871,7 +871,7 @@
     'phui-status-list-view-css' => 'd5263e49',
     'phui-tag-view-css' => 'b4719c50',
     'phui-theme-css' => '9f261c6b',
-    'phui-timeline-view-css' => 'f21db7ca',
+    'phui-timeline-view-css' => 'e2ef62b1',
     'phui-two-column-view-css' => '44ec4951',
     'phui-workboard-color-css' => '783cdff5',
     'phui-workboard-view-css' => '3bc85455',
diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -594,6 +594,7 @@
     'DifferentialRevisionUpdateHistoryView' => 'applications/differential/view/DifferentialRevisionUpdateHistoryView.php',
     'DifferentialRevisionViewController' => 'applications/differential/controller/DifferentialRevisionViewController.php',
     'DifferentialRevisionVoidTransaction' => 'applications/differential/xaction/DifferentialRevisionVoidTransaction.php',
+    'DifferentialRevisionWrongStateTransaction' => 'applications/differential/xaction/DifferentialRevisionWrongStateTransaction.php',
     'DifferentialSchemaSpec' => 'applications/differential/storage/DifferentialSchemaSpec.php',
     'DifferentialSetDiffPropertyConduitAPIMethod' => 'applications/differential/conduit/DifferentialSetDiffPropertyConduitAPIMethod.php',
     'DifferentialStoredCustomField' => 'applications/differential/customfield/DifferentialStoredCustomField.php',
@@ -5647,6 +5648,7 @@
     'DifferentialRevisionUpdateHistoryView' => 'AphrontView',
     'DifferentialRevisionViewController' => 'DifferentialController',
     'DifferentialRevisionVoidTransaction' => 'DifferentialRevisionTransactionType',
+    'DifferentialRevisionWrongStateTransaction' => 'DifferentialRevisionTransactionType',
     'DifferentialSchemaSpec' => 'PhabricatorConfigSchemaSpec',
     'DifferentialSetDiffPropertyConduitAPIMethod' => 'DifferentialConduitAPIMethod',
     'DifferentialStoredCustomField' => 'DifferentialCustomField',
diff --git a/src/applications/differential/engine/DifferentialDiffExtractionEngine.php b/src/applications/differential/engine/DifferentialDiffExtractionEngine.php
--- a/src/applications/differential/engine/DifferentialDiffExtractionEngine.php
+++ b/src/applications/differential/engine/DifferentialDiffExtractionEngine.php
@@ -268,6 +268,16 @@
 
     $xactions = array();
 
+    // If the revision isn't closed or "Accepted", write a warning into the
+    // transaction log. This makes it more clear when users bend the rules.
+    if (!$revision->isClosed() && !$revision->isAccepted()) {
+      $wrong_type = DifferentialRevisionWrongStateTransaction::TRANSACTIONTYPE;
+
+      $xactions[] = id(new DifferentialTransaction())
+        ->setTransactionType($wrong_type)
+        ->setNewValue($revision->getModernRevisionStatus());
+    }
+
     $xactions[] = id(new DifferentialTransaction())
       ->setTransactionType(DifferentialTransaction::TYPE_UPDATE)
       ->setIgnoreOnNoEffect(true)
diff --git a/src/applications/differential/xaction/DifferentialRevisionWrongStateTransaction.php b/src/applications/differential/xaction/DifferentialRevisionWrongStateTransaction.php
new file mode 100644
--- /dev/null
+++ b/src/applications/differential/xaction/DifferentialRevisionWrongStateTransaction.php
@@ -0,0 +1,41 @@
+<?php
+
+final class DifferentialRevisionWrongStateTransaction
+  extends DifferentialRevisionTransactionType {
+
+  const TRANSACTIONTYPE = 'differential.revision.wrong';
+
+  public function generateOldValue($object) {
+    return null;
+  }
+
+  public function generateNewValue($object, $value) {
+    return $value;
+  }
+
+  public function getIcon() {
+    return 'fa-exclamation';
+  }
+
+  public function getColor() {
+    return 'pink';
+  }
+
+  public function getActionStrength() {
+    return 4;
+  }
+
+  public function getTitle() {
+    $new_value = $this->getNewValue();
+
+    $status = DifferentialRevisionStatus::newForStatus($new_value);
+
+    return pht(
+      'This revision was not accepted when it landed; it landed in state %s.',
+      $this->renderValue($status->getDisplayName()));
+  }
+
+  public function getTitleForFeed() {
+    return null;
+  }
+}
diff --git a/webroot/rsrc/css/phui/phui-timeline-view.css b/webroot/rsrc/css/phui/phui-timeline-view.css
--- a/webroot/rsrc/css/phui/phui-timeline-view.css
+++ b/webroot/rsrc/css/phui/phui-timeline-view.css
@@ -315,6 +315,10 @@
   background-color: {$violet};
 }
 
+.phui-timeline-icon-fill-pink {
+  background-color: {$pink};
+}
+
 .phui-timeline-icon-fill-grey {
   background-color: #888;
 }