Speaking of gruesome imagery... I read this story about a small miltary reactor the SL-1 reactor, which, had a stuck control rod. A guy went down to break it free, and, in the process, pulled control rod out WAY too far, causing the reaactor to overload, and exploded vertically, impaling the guy to the ceiling.
The radiation was so bad that small groups of 1 or 2 men would run in, do 1 or 2 minutes worth of work, then run out because the radiation was so bad. It was exactly this accident which caused the NRC to make the rule that it has to be impossible to withdraw a control rod beyond a certain point to prevent any such thing ever happening again.
To drag back topic though, you're nuts if you think you could expose one's self the 100 times less atmospheric pressure than the earth and think you'd last more than seconds...
Also, the one place I don't think has been mention is Venus... not the surface, but about 50km up is really close in temp AND pressure, hence, would make my list of non-Terran spots to poke your head out the window unaided.