diff --git a/src/main.rs b/src/main.rs
index 473e6e7..ba8f74e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,7 +5,9 @@ use sound::{Sound, SoundEffect, SoundEffectSamples, SoundSystem};
 use specs::prelude::*;
 use specs_derive::Component;
 use std::{
+    array,
     cmp::{max, min},
+    iter,
     time::{Duration, Instant},
 };
 use vga_color as vga;
@@ -22,6 +24,7 @@ struct LevelNumber(u32);
 struct SoundEffects {
     step_sound: SoundEffectSamples,
     pickup_sound: SoundEffectSamples,
+    bad_key_sound: SoundEffectSamples,
 }
 
 #[derive(Component)]
@@ -104,7 +107,11 @@ fn player_input(gs: &mut State, ctx: &mut BTerm) {
                 let pickup_sound = sound_effects.pickup_sound.clone();
                 gs.sound_system.play_sound(pickup_sound);
             }
-            _ => {}
+            _ => {
+                let sound_effects = gs.ecs.fetch::<SoundEffects>();
+                let bad_key_sound = sound_effects.bad_key_sound.clone();
+                gs.sound_system.play_sound(bad_key_sound);
+            }
         },
     }
 }
@@ -191,6 +198,26 @@ fn main() -> BError {
         ],
     });
 
+    let bad_key_sound = ss.render_sound_effect(&SoundEffect {
+        sounds: iter::once(Sound {
+            sound_type: SoundType::Tone(400),
+            duration: Duration::from_millis(20),
+        })
+        .chain((0..4).flat_map(|_| {
+            array::IntoIter::new([
+                Sound {
+                    sound_type: SoundType::Tone(100),
+                    duration: Duration::from_millis(15),
+                },
+                Sound {
+                    sound_type: SoundType::Silence,
+                    duration: Duration::from_millis(15),
+                },
+            ])
+        }))
+        .collect(),
+    });
+
     let mut gs = State {
         ecs: World::new(),
         // sound_sender: tx,
@@ -202,6 +229,7 @@ fn main() -> BError {
     gs.ecs.insert(SoundEffects {
         step_sound,
         pickup_sound,
+        bad_key_sound,
     });
 
     gs.ecs.register::<Position>();