diff --git a/containers/slides/examples/phone-for.py b/containers/slides/examples/phone-for.py
index 69667a1e..9210c0dc 100644
--- a/containers/slides/examples/phone-for.py
+++ b/containers/slides/examples/phone-for.py
@@ -1,17 +1,24 @@
 phonebook = {"adam": "0701234567", "bertil": "0721234567"}
 phonebook["cesar"] = "0731234567"
 phonebook["david"] = "0741234567"
+phonebook["adam"] = "0751234567"
+phonebook["johan"] = "0701234567"
+phonebook["ivar"] = "0701234567"
+phonebook["helge"] = "076124567"
 
+# print the phonebook nicely aligned
 i = 1
-for name in phonebook:
-    print(f"{name:10s}", end="")
-    if i % 5 == 0:
+for name1 in phonebook:
+    print(f"{name1:10s}", end="")
+    if i % 3 == 0:
         print("")
+    i += 1
 print("")
 
+# ask the user for look-ups
 while True:
-    name = input("Who's phone number? ")
-    if name == "":
+    name2 = input("Who's phone number? ")
+    if name2 == "":
         break
-    print(f"{name} has phone number {phonebook[name]}.")
+    print(f"{name2} has phone number {phonebook[name2.lower()]}.")
 
diff --git a/containers/slides/examples/phone.py b/containers/slides/examples/phone.py
index 644807b5..2122bff3 100644
--- a/containers/slides/examples/phone.py
+++ b/containers/slides/examples/phone.py
@@ -1,4 +1,13 @@
 phone = {"adam": "0701234567", "bertil": "0721234567"}
 
-name = input("Who's phone number?")
-print(f"{name} has phone number {phone[name]}.")
+while True:
+  name = input("Who's phone number?").lower()
+  if name == "":
+    break
+  try:
+    print(f"{name} has phone number {phone[name]}.")
+  except KeyError as err:
+    print(f"Sorry, {name} is not in the phone book.")
+  except Exception as err:
+    print(f"Unexpected error: {err}")
+
diff --git a/containers/slides/examples/pile.py b/containers/slides/examples/pile.py
index 1f979622..a6ed2aee 100644
--- a/containers/slides/examples/pile.py
+++ b/containers/slides/examples/pile.py
@@ -1,6 +1,9 @@
 pile = []
-pile.append(1)
-pile.append(2)
-pile.append(3)
+pile.append("Bertil")
+pile.append("Adam")
+pile.append("Cesar")
+
 while pile:
     print(pile.pop())
+
+print("Done!")
diff --git a/containers/slides/examples/queue.py b/containers/slides/examples/queue.py
index 155c8de5..46bc0ac5 100644
--- a/containers/slides/examples/queue.py
+++ b/containers/slides/examples/queue.py
@@ -1,8 +1,11 @@
 import collections
 
 q = collections.deque()
+q.append(0)
 q.append(1)
 q.append(2)
 q.append(3)
+q.append(4)
+
 while q:
     print(q.popleft())
diff --git a/containers/slides/examples/sets.py b/containers/slides/examples/sets.py
index 14d09c3a..5e897d23 100644
--- a/containers/slides/examples/sets.py
+++ b/containers/slides/examples/sets.py
@@ -1,5 +1,6 @@
 ns = {1, 2, 2, 3, 3, 3}
 ms = {1, 1, 2, 3, 3, 3, 3}
+
 if ns == ms:
   print("Would be weird otherwise.")
 else: