diff -r 6e3e91662216 Lib/subprocess.py
--- a/Lib/subprocess.py	Thu Mar 13 19:08:10 2014 +0100
+++ b/Lib/subprocess.py	Thu Mar 20 23:18:06 2014 +0200
@@ -592,6 +592,11 @@
     If universal_newlines=True is passed, the return value will be a
     string rather than bytes.
     """
+
+
+    if isinstance(popenargs[0], list) and kwargs["shell"]==True:
+        raise ValueError('Use of iterable and shell=True leads to strange behavior')
+
     if 'stdout' in kwargs:
         raise ValueError('stdout argument not allowed, it will be overridden.')
     if 'input' in kwargs: