How to translate 脑袋短路 into English? I would ask this on ELL but I honestly have no idea how to express this in English. Online translation give &quot;brain short circuit&quot;, which sounds more like terminology than self-mockery. I am looking for a translation that fits here:

A: 你刚刚要说什么? (= what were you gonna say?)
B: 没什么, 我脑袋短路了. (= nothing, I just ____.)

Another imaginary situation:

Some guy solves a math problem using a very complex method, and some other person shows him that it can be done very simply, and he says: &quot;Oh! Right! I ___(脑袋短路了).&quot;
脑袋-短路, based on what I understand, just means literally that the brain short-circuited or malfunctioned as an electrical circuit would. The expression that comes to mind in English is:


  I blanked out for a second. 


Or 


  My mind went blank. 


Or perhaps 


  I spaced out for a second.