Not only do they exist -- there's even a reason for them:
We've all goofed up and flubbed up things we've previously done time and again.
It turns out the root of these brain farts may be a special kind of abnormal brain activity that begins up to 30 seconds before a mistake even happens.
The solution to such screw-ups could be a kind of mind-reading hat, a device to predict and even prevent mindless errors that can threaten lives.
I actually thought of calling my blog that, but why go for the obvious?