Rationalism

Have you ever thought just a tad bit to much? Say, for instance, you are sitting somewhere doing nothing, thinking of nothing, just sitting. All of the sudden a completely random and absurd thought pops into your head.
The most retarded one i have ever had was, as a human, being unable to breath under water... i'll take a second to let you process that.
...
Okay, so one time on the way to a pool and i suddenly started thinking how stupid it was that humans cannot breath under water. Suddenly my brain started rationalizing that the only reason we can't breath under water was that our bodies are naturally opposed to having water in their lungs.
Then the rationalizing continued to the point of saying that if i could "override" the natural reaction of gagging and resisting water in the lungs, then i could breathe underwater.
The incredibly insane rationalization continued all the way to the pool. When we got there i jumped in with everyone else and tried to breathe the water. Sufficed to say it didn't work. I hurried out of the pool and gagged for a minute or two then continued on with my swimming, making sure to hold my breath and not try to breathe the water ever again.
Just so you all know i was much, much younger when this happened, so don't think this is anything recent, however, it might not be outside the realm of possibilities of something i would concievably do.
Anyway, that's just a clue in as to how the mind can rationalize anything and everything to be possible, regarless of whether it is really possible or not.

... and yes, i can hear you laughing at me from there...