When you're on your motorbike, going through heavy terrain, and the sensations of everything around you combine to tickle your brain. It doesn't hurt, but you feel your brain suspended, moving, and maybe even slightly bouncing around your skull, resulting in a brain tickle.
Jack revved his engine and as he slashed and dashed through the dirt bumps and turns he was welcomed with an all too familiar feeling of brain tickles underneath his helmet.
by TecateFox November 3, 2013