diff --git a/src/applications/auth/provider/PhabricatorAuthProvider.php b/src/applications/auth/provider/PhabricatorAuthProvider.php
--- a/src/applications/auth/provider/PhabricatorAuthProvider.php
+++ b/src/applications/auth/provider/PhabricatorAuthProvider.php
@@ -180,7 +180,7 @@
   protected function renderLoginForm(
     AphrontRequest $request,
     $mode) {
-    throw new Exception('Not implemented!');
+    throw new PhutilMethodNotImplementedException();
   }
 
   public function createProviders() {
@@ -295,7 +295,7 @@
   }
 
   public function getDefaultExternalAccount() {
-    throw new Exception('Not implemented!');
+    throw new PhutilMethodNotImplementedException();
   }
 
   public function getLoginOrder() {
diff --git a/src/applications/differential/render/DifferentialChangesetOneUpRenderer.php b/src/applications/differential/render/DifferentialChangesetOneUpRenderer.php
--- a/src/applications/differential/render/DifferentialChangesetOneUpRenderer.php
+++ b/src/applications/differential/render/DifferentialChangesetOneUpRenderer.php
@@ -67,11 +67,13 @@
     return null;
   }
 
-  public function renderFileChange($old_file = null,
-                                   $new_file = null,
-                                   $id = 0,
-                                   $vs = 0) {
-    throw new Exception('Not implemented!');
+  public function renderFileChange(
+    $old_file = null,
+    $new_file = null,
+    $id = 0,
+    $vs = 0) {
+
+    throw new PhutilMethodNotImplementedException();
   }
 
 }
diff --git a/src/applications/differential/render/DifferentialChangesetTestRenderer.php b/src/applications/differential/render/DifferentialChangesetTestRenderer.php
--- a/src/applications/differential/render/DifferentialChangesetTestRenderer.php
+++ b/src/applications/differential/render/DifferentialChangesetTestRenderer.php
@@ -76,11 +76,13 @@
   }
 
 
-  public function renderFileChange($old_file = null,
-                                   $new_file = null,
-                                   $id = 0,
-                                   $vs = 0) {
-    throw new Exception('Not implemented!');
+  public function renderFileChange(
+    $old_file = null,
+    $new_file = null,
+    $id = 0,
+    $vs = 0) {
+
+    throw new PhutilMethodNotImplementedException();
   }
 
 }
diff --git a/src/applications/phid/type/PhabricatorPHIDType.php b/src/applications/phid/type/PhabricatorPHIDType.php
--- a/src/applications/phid/type/PhabricatorPHIDType.php
+++ b/src/applications/phid/type/PhabricatorPHIDType.php
@@ -135,7 +135,7 @@
   public function loadNamedObjects(
     PhabricatorObjectQuery $query,
     array $names) {
-    throw new Exception('Not implemented!');
+    throw new PhutilMethodNotImplementedException();
   }
 
 
diff --git a/src/applications/search/engine/PhabricatorApplicationSearchEngine.php b/src/applications/search/engine/PhabricatorApplicationSearchEngine.php
--- a/src/applications/search/engine/PhabricatorApplicationSearchEngine.php
+++ b/src/applications/search/engine/PhabricatorApplicationSearchEngine.php
@@ -244,7 +244,7 @@
   }
 
   protected function getApplicationClassName() {
-    throw new Exception(pht('Not implemented for this SearchEngine yet!'));
+    throw new PhutilMethodNotImplementedException();
   }
 
 
diff --git a/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php b/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
--- a/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
+++ b/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php
@@ -327,7 +327,7 @@
   protected function applyInitialEffects(
     PhabricatorLiskDAO $object,
     array $xactions) {
-    throw new Exception('Not implemented.');
+    throw new PhutilMethodNotImplementedException();
   }
 
   private function applyInternalEffects(
diff --git a/src/applications/transactions/storage/PhabricatorApplicationTransaction.php b/src/applications/transactions/storage/PhabricatorApplicationTransaction.php
--- a/src/applications/transactions/storage/PhabricatorApplicationTransaction.php
+++ b/src/applications/transactions/storage/PhabricatorApplicationTransaction.php
@@ -76,7 +76,7 @@
   }
 
   public function getApplicationTransactionCommentObject() {
-    throw new Exception('Not implemented!');
+    throw new PhutilMethodNotImplementedException();
   }
 
   public function getApplicationTransactionViewObject() {