Inflatable Missile Balloons

Looking for a way to get some attention on the highway? Try these helium-filled missile balloons:

The concept is pretty simple:
Fill balloons with helium
Attach balloons to car
Drive like a crazy person and delight in other drivers’ reactions

While these were originally created as a Malaysian advertisement that won a CLIO in 2004, MissileBallon.com now sells customizable inflatable missiles on their website.
These can’t be legal to drive with, can they?