A couple of crashers of the "won't fix" kind.

Lib/test/crashers/bogus_code_obj.py

@@ -0,0 +1,9 @@
+"""
+Broken bytecode objects can easily crash the interpreter.
+"""
+
+import types
+
+co = types.CodeType(0, 0, 0, 0, '\x04\x71\x00\x00', (),
+                    (), (), '', '', 1, '')
+exec co

Lib/test/crashers/gc_inspection.py

@@ -0,0 +1,17 @@
+"""
+gc.get_referrers() can be used to see objects before they are fully built.
+"""
+
+import gc
+
+
+def g():
+    marker = object()
+    yield marker
+    # now the marker is in the tuple being constructed
+    [tup] = [x for x in gc.get_referrers(marker) if type(x) is tuple]
+    print tup
+    print tup[1]
+
+
+tuple(g())