diff --git a/collects/mztake/demos/random/random-mztake.ss b/collects/mztake/demos/random/random-mztake.ss
deleted file mode 100644
index e0b773a969..0000000000
--- a/collects/mztake/demos/random/random-mztake.ss
+++ /dev/null
@@ -1,35 +0,0 @@
-(require (lib "animation.ss" "frtime")
-         (lib "mztake.ss" "mztake")
-         (lib "useful-code.ss" "mztake")
-         (as-is mzscheme assoc))
-
-(define/bind (loc "random.ss" '(loop _)) x)
-
-(define (assoc-inc l x)
-  (let ([filtered (filter (lambda (y) (not (eq? x (first y)))) l)]
-        [new-pair (let ([r (assoc x l)])
-                    (if r `(,x ,(add1 (second r)))
-                        `(,x 1)))])
-    (cons new-pair filtered)))
-
-(define histogram
-  (accum-b ((changes x) . ==> . (lambda (x) (lambda (h) (assoc-inc h x))))
-           empty))
-
-(define x-scale 15)
-(define y-scale 20)
-
-(define (make-histogram-rectangle p)
-  (let ([bin (first p)]
-        [count (second p)])
-    (make-rect (make-posn (* bin x-scale) 0)
-               x-scale (* count y-scale)
-               "blue")))
-
-(define rectangles (map make-histogram-rectangle histogram))
-
-(display-shapes rectangles)
-
-(define largest-bin (apply max (cons 0 (map second histogram))))
-
-(set-running! (< largest-bin 18))
diff --git a/collects/mztake/demos/random/random.png b/collects/mztake/demos/random/random.png
deleted file mode 100644
index 286d3175e8..0000000000
Binary files a/collects/mztake/demos/random/random.png and /dev/null differ
diff --git a/collects/mztake/demos/random/random.ss b/collects/mztake/demos/random/random.ss
deleted file mode 100644
index 87c608bdc0..0000000000
--- a/collects/mztake/demos/random/random.ss
+++ /dev/null
@@ -1,5 +0,0 @@
-(module random mzscheme
-  (define (run)
-    (let loop ([x (random 20)])
-      (loop (random 20))))
-  (run))
\ No newline at end of file
diff --git a/collects/mztake/demos/sine/sine-mztake.ss b/collects/mztake/demos/sine/sine-mztake.ss
deleted file mode 100644
index 00b70e6ff1..0000000000
--- a/collects/mztake/demos/sine/sine-mztake.ss
+++ /dev/null
@@ -1,26 +0,0 @@
-(require (lib "animation.ss" "frtime")
-         (lib "useful-code.ss" "mztake"))
-(require (lib "mztake.ss" "mztake"))
-
-(define/bind (loc "sine.ss" '(if _) ) x sin-x)
-
-(define (pick-cute-color x y)
-  (if (< 200 y)
-      (if (< 200 x) "blue" "darkblue")
-      (if (< 200 x) "red" "darkred")))
-
-(define (make-cute-circle x y)
-  (make-circle (make-posn x y)
-               5
-               (pick-cute-color x y)))
-
-(display-shapes
- (list* (make-line (make-posn 0 200) (make-posn 400 200) "gray")
-        (make-line (make-posn 200 0) (make-posn 200 400) "gray")
-        
-        (let ([x (+ 200 x)]
-              [sin-x (+ 200 (* 100 sin-x))])
-          (history-b (changes (make-cute-circle x sin-x)) 50))))
-
-(set-running! #t)
-
diff --git a/collects/mztake/demos/sine/sine.ss b/collects/mztake/demos/sine/sine.ss
deleted file mode 100644
index 93739c30b1..0000000000
--- a/collects/mztake/demos/sine/sine.ss
+++ /dev/null
@@ -1,8 +0,0 @@
-(module sine mzscheme
-  (define (run)
-    (let loop ([x -200])
-      (let ([sin-x (sin (/ x 20.0))])
-        (if (x . < . 200)
-            (loop (add1 x))
-            (loop -200)))))
-  (run))
\ No newline at end of file