I'll just show what irrationality is about from a brief glimpse at something that floats around on the net still to this day:
http://byamerican.com/cgi-bin/archiveast/config.cgi?read=13136
a brief history into how my mind was at the time, I first got onto the internet in 1996 and I as a late teen decided to look into how to make websites, the problem I had wasn't that I couldn't design a website but more to the fact I had no content for one.
The internet at the time was a place filled with like minded people that liked discussing the same sort of things that we discuss here at sciforums, and I decided that I wanted content for my website. Now to fill it with content I decided that I wanted to create outside theories on un-answered and obscure questions, with my emphasis on gaining hits to my website or getting my theories acknowledged.
This was my reason for reading, thinking and writing about subjects like we deal with here in pseudoscience originally and that continued up until mid 1999. Then I had to stop doing drugs because of the consequences of doing them. My body had got to the point where it had reached saturation and something had to give, resulting in a few panick attacks.
Cannabis CAN be hallucinogenic if done in quantity and with certain qualities. If a very high amount of THC is present in a particular well grown batch of green then you'll trip, if you happen to have a poor quality solid cannabis type thats suppose to only contain pressed cannabis it's likely that it also contains plastic film/wrapping and potentially other chemicals placed their to enhance it's addictiveness or lower it's scent in regards to snifferdogs. The contaminents can be hazardous.
I mention this because I had two reasons for quitting...
1: I wanted to study and to study means looking at the evidence not just dealing constantly with presumption.
2: My usage of Cannabis cause a chemical change in my brain which means if I do smoke it or injest it, I end up suffering a panick attack.
The latter points a pain because if it was ever found that I had some ailment that could be cured or at least made more comfortable by the use of Cannabis, I won't be able to use it because of the change to my physiology.
In 2000 I completely stopped it's usage, however for a few years afterwards I suffered from the damage caused by usage and from realising that some of my basic understandings of physics and the world were completely inaccurate. I'm still to this day learning and realising things I might of errored in previously, and as Phlogistician mentions it's difficult to actually admit when something has been wrong. You might not bring whatever it was up in the future and just hope that eventually it will be swept under the carpet.
In my case however I realised after 2000 or so that what you post on the net potentially sits there archived for future prosperity. Which is kind of what I tried to explain to you posters about how I was moderating, namely why I would leave you posts intact and your comments because one day you'll have to come to terms with anything that was inaccurate or how harsh you might have been on others.
btw, I never did really build a decent website, I still lacked the content and I realised that I didn't want to fill a website with delusion thinking for both my own wellbeing and to stop others potentially drawing the wrong conclusions based upon my written work and irrational thinking.