diff --git a/samples/bounce.scm b/samples/bounce.scm
index b42298d..b35bb39 100644
--- a/samples/bounce.scm
+++ b/samples/bounce.scm
@@ -107,11 +107,19 @@
 	      'entity
 	      '(<rigidbody-2d>)
 	      (lambda (_ rbody)
-		(when (pop-event 'input 'boost)
+		(when (peek-event 'input 'boost)
 		  (set-rigidbody-2d-velocity! rbody
 					      (v* 2
 						  (rigidbody-2d-velocity rbody)))))))
 
+(add-system
+ (make-system 'clear-boost
+	      4
+	      'global
+	      '()
+	      (lambda ()
+		(pop-event 'input 'boost))))
+
 (define (make-ball position velocity color)
   (create-entity
    (make-visual-2d