"And where is the analysis?"
"That," replied Hardin, "is the interesting thing. The analysis was the most difficult of the three by all odds. When Holk, after two days of steady work, succeeded in eliminating meaningless statements, vague gibberish, useless qualifications – in short, all the goo and dribble – he found he had nothing left. Everything canceled out."
"Lord Dorwin, gentlemen, in five days of discussion didn't say one damned thing, and said it so you never noticed."
IMHO this is the most undervalued quote from Azimov's "Foundation".
I can not count all the times I had this reference in mind but couldn't use it, because I couldn't rely that the audience will get it.
The irony is not in the snippet itself. It is in the situation when it is applied.
It is when you read a certain press-release, or listen to a person talking and then the only thing you want to say at the end is
"[That well spoken person], gentlemen, in five days of discussion didn't say one damned thing"
Aleksandra Fedorova 
Mehmet Tekman