When facepalm isn't enough, its close relative facefist is one step up. It's used when a feeling of frustration agitation or the witnessing of an act of stupidity is so overwhelming that you feel the need to punch yourself in the face.
Teacher: Now class, can anyone tell me what the first 6 prime numbers are?
Student: uumm... 1,2,3,5,7, and 9?
Teacher: That's all correct except 2.
Student: But 5 minutes ago I thought you said that a prime number could only be divided by 1 or itself? Doesn't 2 fit those requirements?
Teacher: I'm sorry, are you saying I'm incorrect?
Teacher: Well in that case you just earned yourself detention!
Student: But why?
Teacher: 2 days detention!!
Student: Ma'am I----
Teacher: DO YOU WANT TO GO FOR A WEEK?!!?!?!