diff --git a/examples/pong/pong.cpp b/examples/pong/pong.cpp
index 11f89f0..2b979f7 100644
--- a/examples/pong/pong.cpp
+++ b/examples/pong/pong.cpp
@@ -1,7 +1,7 @@
 /**
  * paradiso - Paradigmen der Softwareentwicklung
  *
- * (c) Copyright 2023 Hartmut Seichter
+ * (c) Copyright 2023-2024 Hartmut Seichter
  *
  */
 
@@ -16,7 +16,6 @@
 
 #include <unordered_map>
 
-#include <iomanip>
 #include <iostream>
 
 struct PongStage {
@@ -86,7 +85,7 @@ struct PongPaddle {
         velocity_horizontal *= whoopiness;
         sprite.pivot.x() += velocity_horizontal;
 
-        std::clamp(sprite.pivot.x(), -0.5f, 0.5f);
+        sprite.pivot.x() = std::clamp(sprite.pivot.x(), -0.5f, 0.5f);
 
         // update shader uniforms
         shader.set_uniform("pivot", sprite.pivot);
@@ -151,7 +150,7 @@ struct PongBall {
 
     void draw(const paradiso::Shader& shader) {
 
-        std::clamp(sprite.pivot.x(), -0.5f, 0.5f);
+        sprite.pivot.x() = std::clamp(sprite.pivot.x(), -0.5f, 0.5f);
 
         // update shader uniforms
         shader.set_uniform("pivot", sprite.pivot);
@@ -166,6 +165,9 @@ struct PongBall {
     paradiso::Renderer renderer{};
 
     constexpr void push(const auto& impulse) noexcept { velocity += impulse; }
+
+    constexpr void whoop(const auto& whoopiness) noexcept { velocity *= whoopiness; }
+
 };
 
 auto main() -> int {
@@ -234,6 +236,19 @@ auto main() -> int {
                 ball.sprite.pivot.x() =  0.0f;
                 ball.sprite.pivot.y() =  0.9f;
             }
+            // speed adjust
+            if (w.keyboard_input().top().key == 'N') {
+
+                std::cout << "Speed Up!\n";
+
+                ball.push(paradiso::Vector2<float>::make(0.f,0.01f));
+
+            } else if (w.keyboard_input().top().key == 'M') {
+
+                ball.push(paradiso::Vector2<float>::make(0.f,-0.01f));
+
+                std::cout << "Speed Lower!\n";
+            }
         }
 
         ball.interact(stage);
@@ -251,4 +266,4 @@ auto main() -> int {
     };
 
     return 0;
-}
\ No newline at end of file
+}