C# has a feature called "extension methods", which are roughly analogous to Ruby mix-ins - Essentially, you can add a method to any pre-existing class definition (for instance, you oould add "reverse()" to String if you were so inclined). That alone is fine- The "Weird" part is that you can add these extension methods, with a method body and everything, to an interface. On the one hand, this can be handy as a way to add a single method to a whole swath of classes which aren't part of the same inheritance tree. On the other, you're adding fleshed out methods to interfaces, essentially breaking the very definition of an interface.

在C中，a[b][C]与C [b[a]]完全相同。

Tcl在解释器中虚拟化的时间钩子非常奇怪: http://www.tcl.tk/cgi-bin/tct/tip/233.html

基本上，它允许你让解释器使用一些其他的时间数据源，例如，先在模拟器中运行硬件测试，然后替换计时器函数，对真实的东西运行相同的测试。

在javaScript中，NaN是一个全局变量。

我喜欢Smalltalk中缺少运算符优先级

2 * 3 + 4 * 5 = 6 + 4 * 5 = 10 * 5 = 50

而不是

2 * 3 + 4 * 5 = 6 + 4 * 5 = 6 + 20 = 26

这是由于smalltalk的对象性质和消息从左向右传递的事实。如果消息*以数字3作为参数发送给2，则该消息的响应为6。太棒了，如果你觉得邪恶，你甚至可以用猴子来修补它。

Go的伪常数Iota:

type ByteSize float64
const (
_ = iota;   // ignore first value by assigning to blank identifier
KB ByteSize = 1<<(10*iota); MB; GB; TB; PB; YB;
)