For a number of years, off and on, I've visited more debate-oriented discussion forums. At some point the argument inevitably devolves into a questioning of the intelligence of the other side, at which point IQs are whipped out to prove whose is bigger.
Funny how, apparently, every single person with internet access has an IQ of at least 125 or so, and the average is well into the 150s.
There's no way to get people to be honest about such a thing... why would anyone admit to an IQ of "only" 110 and cast doubt on their intelligence and therefore the value of anything they have to say?
The first two IQ tests I took came up with values, I believe, of 120 and 135. If someone asked me what my IQ is, which do you think I'd admit to? Yeah.
Outside a controlled study, it's just a worthless measurement.