Good one Ryan!  I have something similar.

A few years back, our town was having its annual celebration. It had been raining off and on all day. I parked my bike on main street during a lull and went into the beer tent. Just as I was getting to the entrance, the skies let loose.

Soon a young brunette approached me.

Girl:  Didn't I just see you get off that motorcycle?

Me:  Yea, you did.

Girl:  Why aren't you soaking wet?

Me:  It is a proven fact that if you drive 82½ MPH, you drive between the drops.

Girl:  Really, I haven't heard that before.

Me:  Do you die your hair?