The nice man explaining the in's and out's of this slingshot cannon looks and sounds exactly like he did the other day when I was imagining what slingshot cannon aficionados might look and sound like. This is not an insult.
Yes, a business card that shoots a magazine of 10 pennies with rubber band power will get you noticed—but it probably won't be the kind of attention you hoped for.
You can create just about anything with Legos, but now we direct your attention to a subset of the Lego-building posse: These guys make guns. The one pictured on the left could even be kinda dangerous, shooting what its maker calls "very strong rubber bands," albeit one at a time.