It wasn't merely that their left hand didn't always know what their right hand was doing, so to speak; quite… — Douglas Adams
It wasn't merely that their left hand didn't always know what their right hand was doing, so to speak; quite often their right hand had a pretty hazy notion as well.
Source: Wikiquote · CC BY-SA 4.0
More from this book
The last time anybody made a list of the top hundred character attributes of New Yorkers, common sense snuck in at number 79.
The thing they wouldn't be expecting him to do was to be there in the first place. Only an absolute idiot would be sitting where he was, so he was winning already. A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.
One of the problems has to do with the speed of light and the difficulties involved in trying to exceed it. You can't. Nothing travels faster than the speed of light with the possible exception of bad news, which obeys its own special laws.

