-
null
(that's the most obvious)-
""
-
.length
-
0
(except as a neutral element for addition, in fold)-
1
(except as a neutral element for multiplication, in fold)- empty list (except as a neutral element for multiplication, in fold)
-
if
-
==
(especially in Java, where typeless equality kills more kittens than regexes parsing XML)-
goto
- I do not know where can one be found though. Feel free to suggest more