I've installed this piece of software several times before and haven't actually noticed this, but now it strikes me as being quite hilarious.
After I installed this piece of software, it politely asked me whether I wanted to restart the system. I answered "No". It then told me something to the effect of "I'm just going to ignore your 'No' answer, because I know what's good for you. So I'm going to go ahead and reboot your system anyway."
It then proceeded to shutdown my session and rebooted.
Guess which piece of software I'm talking about. :-)
Hint: it's a development tool.
OK. So it's a pretty old piece of software. But still...that's a pretty good usability screw-up, if there is such a thing.