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there is still friction in a vacuum. there is just no air resistance. it is impossible to ever completely eliminate friction, unless you had an object with no moving parts flying through space.
it'd be a pretty cool idea for a teacher to show some of these to a lower level physics class and have them explain in physics terms why they wouldnt work
YOU FAIL AT LIFE, in 1836 muskets shot lead balls, they would madly deform and fly off target because of uneven surface area, in the year 2010 we have this stuff called steel (i think, im not sure what we use... but its not lead anymore) and this cool stuff called steel (again, im not sure exactly what it is) doesent do that shit!!!! omfg bullets actually shoot straight!!!!!!!!