diff --git a/examples/events/__main__.py b/examples/events/__main__.py
index a95770c..83cdac1 100644
--- a/examples/events/__main__.py
+++ b/examples/events/__main__.py
@@ -15,17 +15,19 @@ class Observer:
         print(f"Registered events: {self._cl.callback.get()}")
 
     def on_current_program_scene_changed(self, data):
+        """The current program scene has changed."""
         print(f"Switched to scene {data['sceneName']}")
 
-    def on_scene_created(self, event, data):
+    def on_scene_created(self, data):
         """A new scene has been created."""
-        print(f"{event}: {data}")
+        print(f"scene {data['sceneName']} has been created")
 
-    def on_input_mute_state_changed(self, event, data):
+    def on_input_mute_state_changed(self, data):
         """An input's mute state has changed."""
-        print(f"{event}: {data}")
+        print(f"{data['inputName']} mute toggled")
 
-    def on_exit_started(self):
+    def on_exit_started(self, data):
+        """OBS has begun the shutdown process."""
         print(f"OBS closing!")
         self._cl.unsubscribe()
 
diff --git a/examples/scene_rotate/__main__.py b/examples/scene_rotate/__main__.py
index 23f71bb..9994d05 100644
--- a/examples/scene_rotate/__main__.py
+++ b/examples/scene_rotate/__main__.py
@@ -4,12 +4,12 @@ import obsstudio_sdk as obs
 
 
 def main():
-    res = cl.GetSceneList()
-    scenes = reversed(tuple(d["sceneName"] for d in res["d"]["responseData"]["scenes"]))
+    resp = cl.get_scene_list()
+    scenes = reversed(tuple(di["sceneName"] for di in resp["scenes"]))
 
     for sc in scenes:
         print(f"Switching to scene {sc}")
-        cl.SetCurrentProgramScene(sc)
+        cl.set_current_program_scene(sc)
         time.sleep(0.5)
 
 
diff --git a/obsstudio_sdk/callback.py b/obsstudio_sdk/callback.py
index fc2c445..8cc4a61 100644
--- a/obsstudio_sdk/callback.py
+++ b/obsstudio_sdk/callback.py
@@ -23,15 +23,12 @@ class Callback:
 
         return [self.to_camel_case(fn.__name__) for fn in self._callbacks]
 
-    def trigger(self, event, data=None):
+    def trigger(self, event, data):
         """trigger callback on update"""
 
         for fn in self._callbacks:
             if fn.__name__ == self.to_snake_case(event):
-                if "eventData" in data:
-                    fn(event, data["eventData"])
-                else:
-                    fn(event)
+                fn(data.get("eventData"))
 
     def register(self, fns: Union[Iterable, Callable]):
         """registers callback functions"""