Quick! Your co-workers are approaching with hand constructed miniature bamboo firing crossbows that shoot bamboo skewers. What do you do?
Why, duck behind your desk and quickly assemble this catapult, of course.
Also from John Austin's Mini Weapons of Mass Destruction: Build Implements of Spitball Warfare, this junk drawer constructed catapult seems equally awesome.
Well, we know what we're doing this weekend.