When it's wet outside we usually ride with a little more caution.

But some people know how to push a little harder:
http://www.spikednation.com/evideo/sbk-wet-qualifying

A skill level to shoot for.  

On the busa, even in the rain, once the tires are warned up they handle just as good as dry. The dangers are the same as fair weather riding rocks, dirt (mud), oils, cagers, water on the visor.

These guys here have no grooves in the tires to push water out, but track design off sets that. Theres NO way I would push my bike that hard in the rain.

Those counter stearing moves are not easy! Even more difficult with the rear end locked up. I had the rear slide out under exceloration ONE time on a wet patch, had go home and wipe, shower, and chande my drawers!