mind blank

The mind is a funny thing. You can remember a ton of stuff and then one day it decided to blank on you with something stupidly simple.
Coming back from lunch today one of the guys asked me when I was doing my presentation. But some some reason I completely blanked and just kind of stared at him. I feel a complete nelly now because I didn't even think to ask him to repeat the question. However thankfully he just said it in english and I managed to jump start myself back into french. Silly old brain!