.
Have you tried the travel sickness pills called "Joyrides"? Very young children can take them and they seem to work quite well, as a child I had the same problem and they worked wonders on me.

If not, I'd go with the punching, at least it doesn't smell and at you can pad out your sleeve with something soft beforehand :)
(Petite chien is going to do science to it, Sun 20 Apr 2008, 15:54, Reply)