Forth可以随时改变数字的基数:

HEX 10 DECIMAL 16 - .
0 Ok

它也不需要是预定义的:

36 BASE ! 1Z DECIMAL .
71 Ok

在PowerShell中，你可以重命名变量:

> $a = "some value"
> $b = "a"
> $c = "d"
> Rename-Item variable:$b $c
> $d
some value

间接间接!PHP!

字面也有用:

> Rename-Item variable:d e
> $e
some value

在Perl中，可以通过修改一个类的@ISA数组来改变它的继承链，这让我很惊讶。

package Employee;
our @ISA = qw(Person);
# somwhere far far away in a package long ago
@Employee::ISA = qw(Shape); 
# Now all Employee objects no longer inherit from 'Person' but from 'Shape'

很简单，Erlang有很多。例如，标点符号的三种形式，

a_function(SomeVariable) ->
  statements_end_with_commas(),
  case PatternMatching of
    0 -> now_we_end_with_semicolon;
    true -> except_the_last_one
  end.

%%  Function definitions end with periods!

JavaScript真值表:

''        ==   '0'           // false
0         ==   ''            // true
0         ==   '0'           // true
false     ==   'false'       // false
false     ==   '0'           // true
false     ==   undefined     // false
false     ==   null          // false
null      ==   undefined     // true
" \t\r\n" ==   0             // true

资料来源:Doug Crockford

Python的everything-is-really-a-reference有一个有趣的副作用:

>>> a = [[1]] * 7
>>> a
[[1], [1], [1], [1], [1], [1], [1]]
>>> a[0][0] = 2
>>> a
[[2], [2], [2], [2], [2], [2], [2]]