Related to 13)...
25)
You've organized and spent all night (2pm till 7am) with 3 team mates writing a game prototype for a demonstration. It works flawlessly. No bugs, no issues loading media. You've taken into account the lower specs of the demonstration computer. Turns out, DirectX isn't installed.
Happened to me just a month ago.
It was for a Uni assignment, and since these Demo computers weren't our normal lab computers, we didn't get to even look at it before we had to run it, and subsequently, lost marks
[EDIT]
Not only that, but we actually happened to have a DX install on my thumb drive (from last time I updated), so:
26)
You need to install some software to give a demonstration, but the computer requires an Administrator account which noone available has.