diff --git a/vibe_bot/database.py b/vibe_bot/database.py
index d9ad452..10513df 100644
--- a/vibe_bot/database.py
+++ b/vibe_bot/database.py
@@ -138,13 +138,17 @@ class ChatDatabase:
 
     def _calculate_similarity(self, vec1: np.ndarray, vec2: np.ndarray) -> float:
         """Calculate cosine similarity between two vectors."""
+        vec1 = vec1.flatten()
+        vec2 = vec2.flatten()
         logger.debug(
             "Calculating cosine similarity between vectors of dimension %d",
             len(vec1),
         )
-        result = float(
-            np.dot(vec1, vec2) / (np.linalg.norm(vec1) * np.linalg.norm(vec2)),
-        )
+        norm1 = np.linalg.norm(vec1)
+        norm2 = np.linalg.norm(vec2)
+        if norm1 == 0 or norm2 == 0:
+            return 0.0
+        result = float(np.dot(vec1, vec2) / (norm1 * norm2))
         logger.debug("Similarity calculated: %.4f", result)
         return result
 
diff --git a/vibe_bot/main.py b/vibe_bot/main.py
index f4f34c1..ae385d7 100644
--- a/vibe_bot/main.py
+++ b/vibe_bot/main.py
@@ -328,6 +328,15 @@ async def on_message(message: Message) -> None:
     await bot.process_commands(message)
 
 
+@bot.command(name="lobotomize")
+async def lobotomize(ctx: CommandsContext[Bot]) -> None:
+    """Clear all conversation history and memory for all bots."""
+    logger.info("Lobotomize command triggered by %s", ctx.author.name)
+    db = get_database()
+    db.clear_all_messages()
+    await ctx.send("All conversation history and memory has been cleared. 🧠✨")
+
+
 @bot.command(name="voices")
 async def voices(ctx: CommandsContext[Bot]) -> None:
     """List all available TTS voices organized by category."""