Jan 2005: Bush and family members saluted the marching band of the University of Texas, whose athletes are nicknamed Longhorns with this gesture.
For many people in the world it has a different meaning, though. It is known as the ‘horns gesture’ or the Corna or mano cornuta, see this great wiki entry. Apparently it caused a bit of misunderstanding in Norway (why Norway, though?)
The norwegian confusion is confusing me though. Were there actual Norwegians being offended? Or did the newspaper just make the observation that it could have happened? (see my reward for gesture mix-up evidence)